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Two things come to mind…
It is typical that leaks slow as the psi drops… yet, when you mention specifically 60 – 70 psi, makes me wonder if the PR-2 pressure protection on the Prevost factory accessory (aux) air tank MIGHT be leaking until it hits it setting point which is about 70 PSI.
Seems all valves do strange things at times… A couple of years ago while I had easy access to my accessory air tank, I removed the tank, removed the PR-2 valve attached to it, and re-located it to the back wall of the steering bay in order to have SUPER EASY access if needed in the future.
Here is the strange part… the near 2-year old PR-2, which is also a one way check valve, began sticking for about a week. I recognized this strange occurrence as when the aux air compress ran, it also filled (back-filled) the primary and secondary tanks.
If it continues, I will definitely appreciate having relocated the PR-2 valve from the tank to the back wall of the steer bay.
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL