We had that happen with one jack and the seals had gone and it had to be replaced. More than one sounds like a check valve has gone bad. Call Lippert, they have good customer service.
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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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