im in a hard fault, use to be able to disconnect battery and it would raise back up, now the compressor doesn't come on at all, this is where im at so far. compressor does work when powered to batt. tank underneath still holds & has pressure, no noticeable leaks, new rear air springs, however when i hook up compressor to batt and remove hose from front air spring there is no air coming out..is it possible my valve blocks are stuck/closed? if so how do i tell? all fuses & relays are good. the bottle is getting/building pressure as well when i hook up compressor pls help. p.s. i bought a usb to obd2 off amazon and tried using the eas unlock program to clear fault no luck.. i really dont want to take it to the dealer