Mercedes-Benz GL550 Questions

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Iwe came back from out of town appro. 250 miles a the code came up that nite. Also with a milfuction code!
tires keep damaging like i need alignment n i notice the pockets are deflated
2009 GL550 getting a leftside headlight error on the dash- Changed the Xenon bulb but that did not resolve the issue. Any sugessions????
I would like to mention that all the controls on the steering wheel don't work and the shifter does not work also.
how to test if transmission control modulE is failed how to replace it? how much is it?
how do i remove the battery from under the front passengers seat