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I believe that valve is a regulator. Turn off the cab leveling and see what happens when you get in the truck. Lower right knob on the control box over the fuel tank.

You need to fix your air system issues before worry about the ctis. Unplug the controller for now. Start the truck watch the air gages they should both slowly (1-2 minutes) come up to 120 psi and then the air dryer should purge. Air pressure should not go down with the truck just sitting.

Not really. If there was a big enough air leak that the tanks didn't get enough pressure to activate the ctis. Do all 5 flash when you start the truck or after a few minutes. The system will time out waiting to see 120psi in the air tanks.

This thread is not intended to be a for sale thread. It is informational so everyone can get the parts they need at cost.

Maybe the valve behind the cab is bad or out of adjustment.

Took a while. I had some assistance from Firestone and Powerpacker tech support.

Cab lift parts are made by Powerpacker. Firestone makes the airbag and sells it to Powerpacker who makes their own assembly. PP997900 is the new replacement air spring. No housing you have to reuse your old one. The spring bolts right in though. Available from Powerpacker for a cool $192.29 each...