2007 GMC Yukon XL 1500 Questions

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I want to make a back up file to use it in case I needed to change the ECU later on. I have the Tech 2 scanner/programmer.
one mechanic say is transmission other say differential. and now i don't trust either one.
# 4 cylinder not firing changed plug and wires coil pack is firing cylinder is still missing
no air leak without trailer.
I have never changed my trans fluid and I have 92k on it. It's red and does not smell. Should I change it? If so, should I do a flush?
When driving down the highway at about 55-65 mph I receive a message concerning service tracktion control and stabilitrac.
This only seems to happen at certain speeds. Warnings do not come on while driving in town.
Both of my retractable rear view mirrors went bad with very little use. The dealership wants to replace them for almost $800.00 for each.
We are looking to see if anyone is having problems with the driver's door handle. Several times when we opened it from the outside it would make a loud popping noise.
The rear air conditioning has stopped working. No air comes out of the vents at all. The front air conditioning works just fine. Is there anything I can do myself, or does this need to be checked by a mechanic? Thanks
I have a 2007 Yukon XL and the rear hatch just started having this problem. Whether I use the key fob or the manual latch on the tailgate, the gate opens only a 1/3 of the way and then closes again. Any idea what the problem may be?
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