My air bags needed replacment last December. The ride suddenly became extremely bumpy, the lights flashed not to exceed 20 MPH, no kidding, I couldn't go over any bumps without feeling like it was a go-cart.
Merry Christmas, bags and front axle was over $3000. The Self Leveling Light kept coming on after being re-set at the dealer, they replaced the sensors for another $500 but the message kept returning. After getting my money back for the sensors, I decided to live with the flashing lights. The compressor works, I hear it now and then, but I cant operate the up/down switch.