L322 2005 air suspension problem.

Hello all... Please help. I have been having trouble with my air suspension on a 2004 but 2005 model range rover 3.0l diesel. It started to not rise.. The touch screen display would say riseing as the lights at the bottom near switch would suggest its at normal ride night. But acctually when u get out the car is on the bump stops.. I have rebuilt the compressor(new ring and seals). This didn't cure the problem. Then about a week later... Hay presto all working fine... Well for about 2 weeks... Now it is just the rear that won't rise(sometimes). It only happens intermittently. I'm confused to as why the touch screen info part reads differnt to what the 3 amber lights do near the controls.. To me it sounds like the system is confused. Can any1 shed some light for me.

Ps.... I have also fitted a new battery.