Dumb question: Is the front down or is the rear up ??? The front struts don't have any air lift to them, only the rear shocks. If the level ride compressor height sensor arm or sensor itself, in the RR wheelwell, suspension arm, is faulty it's possible that the rear is raised to max height which will give the car a definite rake. Other problems are a faulty compressor, exhaust valve, or dryer/filter assembly. The compressor is subject to condensation of compressed air moisture which corrodes internal parts.
Lots of threads and posts on the ELC system......use the search button up in the blue bar.