Read your warranty paperwork carefully. Items that are covered are listed. Mercedes is quite specific about this. Things not on the list are not covered.
Sometimes, things are covered under a blanket like "power accessories" or other similar language. On my car the coverage says things like "engine accessories" instead of listing water pump, alternator, etc. It also says "electrical motors" which might cover your rearview mirror. On my car it would cover the sunroof motor, window motors, blower motor, and so on...
The most important thing for you to do is sit down and read that booklet VERY carefully, and understand it.
1998 C230 "Black Betty"