Chuck,

Ignore voltages and the like for the moment and define some things that will help diagnose your problem. First, how much does your front axle weigh and what is the rating on the Prevost axle weights data plate. Let's get past that issue. If you are overloaded on the front axle you may not have a mechanical problem.

But then step by step define for us what you are doing, and the results. It sounds to me that you go to the manual position on your leveling system and attempt to raise the front to its maximum height and that is not happening. With a Liberty you go to the manual position, then switch the front switch to the up position and just wait. If the dryer spits your aux pressure should be at the max pressure and unless it is leaking substantially from somewhere that pressure should be going into the front air bags. Can you provide some additional detail?

FWIW, when the switches are set as I described above you have an open path from the air bags in the front of the coach to the aux air system pressure. So as the aux system pressure goes up or down so will the air bag pressure. I think your issue may not be suspension related as much as aux system related. But tell us more.