My problem is very similar - if I watch VCDS and operate to lift mode the compressor starts and it lifts, but the front right lags. When the compressor stops, the front right sinks and I can see the deviation in VCDS change around 1mm a second. The Compressor runs for a couple of mins and gets to 80 degrees C. It never goes above 7.5BAR presumably because there is a leak.
I need to spray soapy water on the strut and the valve block.
Maybe the valve block as an internal leakdown? New pattern parts are £60. Almost worth a punt. The strut normally bubbles at the very bottom with the weight of the car on it, not so much if jacked-up. I thought about swapping the pipes over on the valve block, but I guess it is too clever and will react badly to the opposite side rising as to what it is commanding.
2dogs1monkey youtube channel has some good videos.
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