Hi, my first post on here. 2 months ago I bought a ML320 2007 from a Merc dealer. Sadly its spent 3 weeks in total off road and 3 visits to dealer. One of the problems was the airmatic compressor which failed and a leaking air hose. Today they are telling me 1 rear air bellow (the air bag I believe) is leaking as car not level. My question is should I be asking they change both rear bellows? If it was a spring they would say change both at same time. this should all be under used warranty so I'm not paying. Warranty and dealer have already spent over £3000 on the car fixing things they should have fixed before they sold it to me. I'm concerned the other rear air bellow may go to. Anyone had similar experience ?