Hello Landies,
My suspension on my 06 supercharged ranged rover is failing. This week it dropped to bumpers. I am trying to use the GAP tool to diagnosis the source(s) of the problem. After pulling the R7 fuse in the engine bay fusebox, the suspension will hold for about 18 hours. After that time drop is starting to be noticeable in the driving. Putting the fuse back in, the air compressor will return the height to the normal. I started to make some plots of the variables to locate the problem. What variables should I start to test to locate the problem?

My exhaust valve is opening while the compressor is running on startup. Is this intended to purge water or a problem?

Thanks