Go for OEM comp and you never have to do it again....cause you probably won't own the vehicle.

Go cheap and you'll buy twice !....just saying

So RR back on its feet . Got an AMK , BUT NOT GENUINE WITH 12MTH WARRANTY AND PAID £332 all in. We will see haw it lasts.

Ok to add, First two nights or 24hrs the suspension dropped 10mm, So levelling out and coming up to scratch immediately . I can put up with this and live in the thought that something is still leaking . Further Investigations?

After three days of running back and forth on 6 ml journeys the sys came to fault again with C1A1364. I have checked the exhaust tubes as this is a venting problem and cant find anything. Took the the large discharge tube off and I can drop the height down with Gap iid. but still slow.Without the Gap tool , I would try and lower the vehicle and only the front would drop , signalling to me that the rear being lighter takes a little more effort. This came apparent using the gap tool as the rear would drop when asked but very very slowly.
I have after various diagnostic resets and prompts managed to leave the car at normal height, not an easy task !

To sum up I reckon the exhaust solenoid is the culprit , any one agree?

Isn't the exhaust solenoid part of the pump?

I reckon you should select Main Gallery Pressure as your live value. Run the car until the pump stops. Ign off and see if the pressure drops.

Yes , the exhaust is part of the pump, correct. I changed over the solenoid with the original AMK one and it works normally on both sides, that is exhaust and pump pressure . Every corner drops in 24hrs but only by 15mm. However not ideal. I've had enough for the moment until I take the fuse 26,( I think that's the number) , I can then catch out the corner or valve that is letting the side down , so to speak!