I'd call Lippert customer service, they are usually great to work with. Personally, I think you have a seal/check valve that's leaking and releasing the pressure internally, but they'll know for sure.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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