I have a 2010 750LI and it is sitting on the passenger side tires front and rear. I have checked the air compressor and it is working, no leaks on the air supply side on the rear strut/air spring or lines, the front is sitting on the tire as well. I know it is not an air strut. I am guessing the control system may need to be reset, the height sensors may be bad, or the actual ride control ecu may be bad. What else would you look at in the system. The driver side will raise and lower it should.