Thanks for the reply, that's one of the things I'm looking for is some knowlege on this system. If its a compressor or ride height sensor I would like to think it wouldnt be too hard to change out. With out knowing how to trouble shoot it you end up throwing parts at it and hoping for a happy ending. I can work on engines and like to think I'm pretty handy with a set of tools but I don't want to jump into this blindly. From searching this toopic it seems like it is pretty rare for there to be any trouble with these newer Expys air ride set ups.