A few minor problems with a '94 S600

Hi,

This is my first time posting here (I frequent the Audiworld Forum mostly) but I have some question regarding a 1994 S600. Lately, the car has had some difficulty with the locking mechanism in the passenger rear door. It seems like the heat is refraining it from moving down, preventing the car from locking. Is there a quick fix for this (besides keeping the car cool)?

Also, the reading lights in the front have gone out. I'd hate to have to bring it to the dealer to fix something so minor. Is it easy to get the whole cover off to replace the bulbs?

Lastly (for now) in the driver's side rear seat adjustment buttons, the backlight that outlines the seat button is also out. How can this be replaced? Do I have to take apart the whole door?

Thanks for all your help!