racetricks

I recently bought a used 1997 Expedition Eddie Bauer 4x4 with the self leveling air suspension system. The system seems to be functioning correctly by raising the vehicle about 1" in the rear and 0.5" in the front while driving and about 2" in the rear and 1" in the front when in 4 wheel drive. My problem is that the vehicle sits about 1" lower on the passenger side than on the drivers side. Can the air suspension system be calibrated to level the vehicle out form side to side as well as front to back ( I know how to adjust the rear sensor to raise the back end up and down, but I'm not how to adjust side to side...or if the system is even capable of that). I have checked for leaks and don't believe there are any in the system. I can put the vehicle in 4 wheel drive, let the suspension raise up to highest level, turn the air suspension switch to the off position (light comes on in the dash..."check suspension"), turn the motor off, and the vehicle will hold the raised height on all four corners indefinitely). any info would help.
Thanks
Mike