I had the passenger front jack replaced and they forgot to close the set screw on the valve (counter clock wise), this caused the slides to move with the jack and visa versa. Check the set screw but tighten it just until it seats, no more. If that doesn't work then it is most likely the valve. As said above call Lippert, they are a great help.
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2020 Montana 3561 Legacy, everything except paint.
2018 Silverado 3500 DRW, 50Gal Transfer Flow, Andersen hitch.
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