uneven rear height disco2

evening pat ,played again to night compressor works for a while ,still no lift.
could it be stuck in lowered mode for hitching up?
or perhaps the calibration values be out stopping it lifting or could it be the valve block in the comp unit?
also can the nanocom re calibrate the level sensors?

hi steve
I ended up in the same situation in the end unfortunatly it ended up being a compressor.
as for the valve block they are immpossible to buy i have a spare compressor i brought of e bay and it looked brand new i new it wasnt though.
And it leaked at the valve block so i complainede to the guy and he despathed me a new looking valve block so now i have a complete compressor but whilst i was waiting for it to come my wife took the disco to landrover & had a new compressor fitted & callerbrated been fine since.