Hello, not sure if anyone could point me in the right direction.
Im doing a friend a favor and looking at his 2004 Range Rovers suspension issue and want to get some incite from some experience here on what may be causing the problem.

Symptoms are:
Suspension warning light is intermediate.
Sagging suspension only on one side of the vehicle.
suspension will inflate properly only to deflate 1.5mi down the road.

i dont have access to diagnostic equipment so any help you guys could offer will be much appreciated. I am not familiar with the RR only my previous DiscoII, do these have airbags that have a pump that fills them? or is it an oil filled suspension?

Solutions:
I plan to take a look under the vehicle to see if i see any signs of visible leakage, listen to see if i can hear anything unusual, also maybe check some fuses to see if theres a bad connection?

any other suggestions?

Thanks so much guys!!!