Rear susspension sag, sprayed air spring with soapy water and found they were leaking air. Replaced both air springs( really an easy job). Lowered vehicle and it still sits way to low. Compressor comes on but will not raise. Jacked the rear end up trying to take the weight off springs. I am puzzled that compressor still kicked on being that it was jacked up higher than normal ride height. Could it be sensors are bad or are shocks in need of replacing?