If the check valve on the Water Pump is leaking while you're connected to a fresh water supply it will allow that fresh water to pass through the water pump and fill your Fresh Water Holding Tank, resulting in water coming out of the Overflow/Vent.
It's happened to me and plenty of others here.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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