AJ.....I seriously doubt the house has ANYTHING to do with the leans.

Your problem is on the RH rear. Verify the three air bags (one on the tag and two on the drive axle) are not leaking. That is immensely easier said than done, but a coach that leans quickly has a leak likely to be heard with a stethoscope.

If you can prove the air bags are leak free, then check the five port Norgren valve ahead of the drive axle, on the forward drive axle bulk head, either behind the fender liner or towards the middle, and if that checks OK look at the three port Norgren on the frame on the RH side between the tag and drive.

If the five port valve is leaking it may be heard leaking from one of the valves in the steer compartment.

Let me really stick my neck out here. I cannot conceive of anything on the house air circuit that can make your coach lean. You can have zero aux air pressure and the bus should not lean. If the tech disagrees, get on the phone to Prevost because he does not understand how the system works.