Honestly, I had some problems w/ my air ride system up to a month ago, I bought a conversion kit from strutmasters and did away with the whole mess. I now have coil springs in back and coil over shocks in front. Ride is very nice, and no more air ride problems, EVER! The kit even comes w/ instructions on how to get rid of the Check Susp light. I am impressed.
If you would rather keep the Air-ride system, strutmasters.com has the shocks and airbags to do it. Hell, I have the airbags, still good, 1 shock thats known good, I think the other is good as well. Solenoid valves, and compressor are bad, sensors, relay are still good. I would sell them if you want, but I would reccommend eliminating the system. I did it myself in about 5 hrs. I had to take a break for beer.
Bill