My friend has a 2007 GL 450. I'm trying to figure out what causes the air suspension to lose height while the car is parked and the engine off. After a few hours of being parked, the whole car seems to sink a few inches. The passenger rear corner seems to sink deeper than the others. After you start the engine, it self-corrects. Typically what is the problem? Is it a module? Are all four-shocks leaking?

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