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No, not that I have ever seen. The Mercedes transmission is state of the art and has at least 5 forward speeds that more than match the engine power and torque curves. If you are having issues with the trans in your MB, go to an ATRA certified transmission shop and have them test drive it.
Depends on where you live and if you have and use 4wd. If you have/use 4wd and live where you need it, say during winter, then 100k is reasonable.
Free? No clue. But actual diagram for a reasonable price, http://www.alldatadiy.com
I have dealt with this in shop where I presently work. The connectors need to have the terminals tightened, for all head lights. It is a quality poor connector in my opinion.
http://www.alldatadiy.com will have pictures and step by step instructions, not free but very reasonable for very good info.
This could very be a problem with the ignition module, so inspect for loss of spark when your car shuts off. If no spark then check to see if the module is triggering the coil.
This may be a blend door problem. There is a door that is used to direct the air either over your heater core, your A/C evaporator or some combination there of, that is why it is called the blend door. On many Ford vehicles this mechanism wears out. ( I know, I was Ford tech ) Have a good shop inspect your car with this in mind.
Check trans fluid level first and foremost on level ground in park with the engine idling.
I say find a competent repair shop ASAP! I work in San Bruno and know of several good repair shops near you. If the bulb keeps blowing, there HAS to be a voltage spike or some other out of spec voltage/short circuit situation. I don't think that your shop is electrically skilled enough to deal with this vehicle, which is very complex, by the way.
Dash lights are supposed to dim when you turn your lights on, because at night, normal illumination of the dash would be way too bright. There is an adjustment knob, look in your owners manual, it is usually on the left hand side of the dash.