Air bag woes

2003 disco with rear air bags which go down when engine is switched off . Have checked for leaks but none where found. When inflated fully before switching off they stay up
Any ideas. Cheers

did u check in the compressor housing the valves aswell? .... doublecheck everything cos if there's a leak u'll end up with a dead compressor.... if no leaks along the system then it might be a management/sensor issue which needs further diagnose. .... try to let it on ORM height over night see what happens