I bought the truck and noticed It went down overnight on the rear right corner. thought it was an airstrut but after replacing it that didn't help. Then I replaced the pipe to the airbag from the Air Suspension Rear Axle Transfer Relief Valve, and still no joy. A local garage told me it may need calibrating on the proper LR software as the diagnostics I had was only able to view certain parts.

we were able to see that the readings on the sensors at each corner were
2.0v +1mm and 2.0v +1mm for both front
rear left 2.1 +5mm
rear right (problem area) 1,7v -9mm

Took it to be calibrated as someone advised it may fix the problem but today its still dropping

The Last thing Im thinking of replacing is the Air Suspension Rear Axle Transfer Relief Valve ( RVH000055 I think is the correct item but haven't tripled checked )

Last week before id had it calibrated I pulled the fuse to the air suspension and the front stayed up while the rear dropped both sides and slightly more on drivers side.

would there be a chance its the compressor or would that rear valve be more likely to be the problem...
not much hair left to pull out haha