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Mercedes-Benz ML350 4MATIC Questions

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My transmission is dry. Need to top up. Whines in low gears. Must have a leak. Used to stop shifting (resumed shifting after turn it off and back on again).
the round controller at the bottom of the vent will not open the vent. It is stuck closed and therefore no air blowing out. I think it would be a simple fix, but need to remove the vent cover?
Will not open or close by button or remote , but latches ok , fuse checked, also where is the motor that lifts and closes the rear tailgate please
While driving my 2013 Mercedes ML350 my turn signals work while driving as I'm driving they stop working I have to stop put car in park turn off the car and turn it back on like I'm rebooting the system they work again only to turn off and not work again what is the problem and how much to get fixed?
when turn signal controls are activated the arrows indicating right or left turn do not work and the windshield wipers come om.
Active headlights inoperable troupe light on
I take extremely good care of my car. Why pay so much for this maintenance C? Exactly what does it entail that I cant do myself?
will not lock sometimes
During the recent hot weather experienced in the Sacramento, California area, (upper 90s, low 100s), my Mercedes-Benz ML350 began cranking, but not starting. After letting the vehicle sit, (sometime for about an hour after it failed to start), the vehicle would then start. It cranked fine each time, but just didn't appear to be getting fuel. Talked to a local Mercedes-only repair shop owner that had recently retired and closed his shop. He suspected either the crankshaft position sensor (CPS) or fuel pump issue. Because his shop closed, I took it to a trusted mechanic, who advised that he'd experienced quite a bit of this lately on Mercedes' and found each of those to be the CPS. Replaced the CPS and all was fine for a day. Next day, it failed to start again. Returned to the shop where he discovered he then wasn't getting fuel to the engine and replaced the pump, after putting the old CPS back in. He advised that it started fine during all his tests, drove it, shut it down, came back later, no issues. Upon picking up the vehicle, (shop was already closed), it didn't initially start. After a few attempts it did. Failed to start the next day so informed him, and he suggested taking it to Mercedes. He also advised that each time he bypassed the fuel pump relay, the vehicle would start each time. Oddly, he stated there wasn't such a relay to replace in the vehicle. Took it to the dealer who I advised of all the foregoing so we didn't have to go through all of this again. Dealer had the vehicle 4 days and kept telling me they were waiting for the vehicle to fail. Upon advising I was just going to come pick the vehicle up, they concluded it was an "M.E." module that needed to be replaced and that it would cost $2200 out the door! They stated that the module must be faulty since the vehicle wasn't getting fuel. I explained about the fuel pump relay bypass and they said that yes, that would work. I asked if they checked to verify that the relay wasn't faulty, they said there's no way to check it. I asked if the ME module produced any error codes or other indications that it wasn't putting out voltage at the point of failure. They said the module doesn't do that, because it doesn't monitor those actions. I asked if they tested for current or voltage at the input to the relay at the point of failure and they simply stated that the module was faulty. I then asked that they simply replace the relay and fuel filter and I'll take responsibility for that. They told me it wouldn't solve my problem and wasn't what their technician arrived at, instead opting to sell me on the $2200 repair. I asked what the process was, if that didn't solve my problem. They said, "they'd have to make it right, as they provide a 2-year warranty on the repair". I asked exactly what that meant in terms of me paying $2200 and my vehicle still displayed the same condition? He said worst case, I "might be able to get SOME of my money back" and that there may be additional costs if other issues were found. Got the vehicle back and out of 5 start attempts, it failed once. So, the issue still exists. I'm trying to find out, if there is a fuel pump relay and if so, where exactly it sits in the fuse panel, what its part number is and if it's a pluggable device I can just put in myself to test "my theory" that the relay is faulty, before agreeing to a $2200 repair that I'm not convinced is my issue. There's no particular frequency or condition under which the startup fails. It occurs more often after it started successfully, the vehicle has been driven and sits, off, for a while. Additionally, upon trying to start it, at the time it fails, if I release the key, the vehicle does continue to crank briefly then stops. I'm okay with accepting the "M.E." unit as faulty, after I know the devices in the path, (relay, wiring, connections) aren't faulty. To my knowledge, based on my conversation with the service manager at Mercedes and the mechanic that troubleshot the issue, these 3 items haven't been tested or eliminated. I also don't know enough about the wiring to test this all out myself. So, some honest, professional, technical input from a Mercedes-knowledgable mechanic would DEFINITELY be appreciated.

Thanks in advance.
When turn on ac, its wind shield becomes foggy,
My 2012 ML350 4MATIC showed red lights warning with message saying Service Required do not Shift Gear, contact dealer. And the car will not start. What could possibly be the problem and what do i do?
What seems to make the problem better or worse? Nothing, it wont start
How long have you had this problem? for two weeks now
What does service E exceeded by 148 days mean
It drive OK I but the gas gauge is on empty
ABS comes on while driving, when I pull over, slow down, something like the brake grabs, jerks, snaps, sounds like metal pulling or coming apart. It feels like its in a front wheel. ??
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