A check valve somewhere that is going bad. That's a good bet.
Not familiar with your unit. a photo of the fill may help.
Some times just sticking a pencil into the fill valve and wiggling, pushing will allow the checkvalve to reseat
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04 Horizon QD, 12 Ford Flex, Excalibar, Brakemaster, Winter Texan, RVin! since 1974
Norm, Donna & Tinker Kat(RIP) 01 Z3
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