Suspension Fault Guidance
 

So need some guidance from everyone.
LR4 displayed "Suspension Fault" when attempting to go from access to normal mode. Also Terrain Response is unavailable.
Everyone once in a while it will work. Currently stuck in "Off Road" height though.
Any ideas on common faults?
Air Compressor is coming on, and the fault happens right when the vehicle is started. It ask me to select height, and then the fault occurs.
Sensor? Switch?
I am looking for some guidance before I bring it to the dealer.