Hello Newton..
Sorry to hear you are still having issues… This may help you troubleshoot your problem further..
Is your entire vehicle ( all 4 corners ) dropping overnight? If yes, then your leak has to be upstream of the main manifold which I believe is near your compressor.
the piping should be divided into 3 sections. rear, front rt and front left. because this is how your transducers are wired.
If you check the area that is common to all four corners this will eliminate a lot of wasted testing.
This area would be at the compressor, the main reservoir, the main manifold, or any of the relative hose connections.
Since this is a slow leak, it may be harder to trace, but there is always a way,it just may take a while but here goes…
Unless there is found to be an internal leak at the compressor, I would eliminate this..
to find out if the compressor or the dump valve is leaking, find the dump section where the compressor depletes the air after going into rest mode.
You know when you get out of the car after after driving and you hear a whiiish of air when you lock the car. find this connection and make sure that once this air releases it stops.This should be a solenoid valve that has a hose connected to one side and goes to ambient air on the other. It may still be seeping and you not be able to hear it.. this will slowly drain all of the air from your system and it will not come back up till you unlock the drivers door and restart the car.
The reason your compressor doesn't start back up and try to pump up the system is because it is in rest mode.
This may be the culprit..
is this what you are experiencing?
That is one possibility.. the other which is much easier is to go from the compressor to the main manifold checking all hoses for slow leaks including the manifold.
To do this.. start the car, and raise it using the raise button. then shut the car off but don't lock it. In fact, I think you have to leave the drivers door open so that it will not go into rest mode. with the car naturally raised, you can use a light soap solution to spray the components and check for bubbles.. this is the most effective way to find small air leaks in tubing and pneumatic components.
With the front lower cover removed, you should have access to most of your pneumatic components..just keep a block or two under the frame for safety but not supporting the car.
Of course if you are only talking abou one wheel, then you just need to find out which hose goes to that wheel of its the front or in case of the rear, take a look at the distribution block in the back of the car where it tees of for the rear wheels.