I just bought radio keys fro MB and a bulb for the cntrl heead cost 7 bucks total. Stuck the radio keys in and the unit came right out. remove the keys to reinstall. the bulb fits in a plug on the bottom. very easy to change.

My seat does the same thing. I dont know abought a warm pee Imkinda like my ass cold and ny legs and back warm strange contrast. LOL

The Pasenger seat switch is dirty, clean and it is good as new. It is a job to removefrom door panel. I found irratic daily use does the same thing.

Mirrors dont know but Id guess that the motor's need a electrical lube/claener.

good luck