Hi there to all my MB buddies. I have a '95 S350, yesterday I tried to open the rear right door and it wouldn't open. Then I tried all the other doors, and they oppened. I have this S350 for six months now and so far I only had a leak of the A/C fluid which I replaced, but when in turn on the A/C I hear this noise which sounds like when the the vacuum assist pulls the doors, the sound that comes after the doors are pulled. Does anybody know what these may be.