94 Coachmen Destiny air suspension not filling

[xHemi]

Hello me and 3 of my friends bought a rv together two years ago and have been working on it (a lot) and using it to take to Colorado for our snowmobile trips. It has been sitting for a few months without use and our air suspension will not fill any of the bags now. We like to work on our own stuff but I just wanted to ask here for ideas to start with.

The Rv is a 40' coachmen destiny assembled by spartan with an 8.3 Cummins. It has a HWH leveling jack system.

Both the front and rear gauges are reading over 100 psi after a few minutes of starting the rig, and the brakes are releasing and operating. We have a light on the dash reading "low air 2" (not sure if related to the problem), and the air suspension will not inflate. We have tried moving the jacks in and out, they currently can't swing down all of the way due to the rv being low to the ground, but the travel light on the panel comes on when the jacks are up and off when they're down.

Is there a manual solenoid we can push somewhere to see if that is bad or are there any other common places that we should start specifically?
Thank you
- Andy

[xHemi]

So we have been trying different things and tapping the PPV valves allowed the air bags to inflate. They must be corroded or have some rust in them, I suppose we’ll replace those and replace whatever filters on the air system we can find.