Do it yourself Short video for removing door panel and install new switch module. Filmed it myself while working, fairly easy repair. New module was 35$ on eBay. My car is Mercedes R350 but is very simar to other models. Send some thumbs up if it helped.
Mercedes Door panel removal Window Switch repair W164 W251 GL320 ML350 R320 R350 R500 06-12
If your Mercede- Benz R Class is leaning to one side and you have replaced your air springs this video will help you pinpoint the issue. After changing the rear air springs and calibrating the rear suspension using STAR the car was still leaning to one side, we found a leak at the air suspension valve body. We sprayed it down with soapy water, activated the compressor and bubbles formed around the leak!
Mercedes-Benz R350 R500 Leaning To One Side W251 R-Class