2011 GL550 suspension issues.
Hi folks, I'm hoping someone here can help me help my incompetent dealership service department in figuring out what's wrong with my suspension, since they're clueless. I notices a metal grinding sound from my car as I was driving it one day and then following that, the airmatic lifting system appeared to not function correctly...The car wasn't self leveling and when I tried lifting it on a flat surface (car not in motion), the car would lift very slowly about an inch then drop and attempt to lift again but not more than 1/2 inch. Took it to the dealer and they say there's nothing wrong with it. I tried showing them the issue but the senior service tech says that it's functioning fine (maybe he needs his eyes checked?). Obviously it's not functioning correctly and they're stumped/and or stupid. Please someone help! The car has 15,000 miles on it, in pristine condition other than this issue. It's still under warranty.