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Your issue could also be with your water pump. It might be allowing water to flow back through the check valve and leaking back into the tank. One way to test, locate you pump, and remove the inlet screen filter. Clean it, and put it back on. Come back a day later, if there is water in the filter housing water is leaking past. Just remember do not turn the pump on.
I would contact Jayco with your vin number and ask for the plumbing diagram.
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