My Audi seamed to get stuck in a level too. I thought I would have to replace the whole thing. So instead of spending outrageous amounts on this air system that is on there, I called Strutmasters.com. I admit they didn't have many options for me but they do have a conversion kit that will get rid of that air. I was skeptic at first but I ordered it anyway.
Was I surprised. Man this kit is flashy, silver and red, and it rides great. I am setting at about medium height but I can ride without worry about the air failing.
Check them out.