Air suspension stuck up

Folks any thoughts?
Discovery 2 (2004), rear offside airsock has inflated to full height and won't go back down. I disconnected the plugs beside the compressor and it went back down, but after 10 mins driving goes back up . I've checked and there's no water on the blow off breather filter . Any pointers would be most welcome

Sorry meant to say, height sensor on that side was replaced last year

Sounds like it could be the ride height sensor, if its only going up on one side

How old are the airbags, did you replace in pairs? if replaced? has the problem just started? height sensor is it clean seized? etc

Unplug the two air supply valves(from sides let the middle one alone) and connect them swapped... according to what happens we'll speak again cos it's important if the same side will missbehave ot the other