Couple of questions:
Is it a Thetford Aqua Magic Style II?
Did you just recently move or have you been parked on the same spot?
Do you use a pressure regulator on the fresh water line?
The reason I ask is because we had a similar incident with ours. Everything was fine, then we moved to a different CG. Water pressure didn't seem to high and we were only there for a couple of days, so I didn't put the regulator on and resulted in a minor flood that night.
Once I installed the regulator no problem. Talked to Thetford Tech Service and didn't get a good straight answer, but sounded like to much pressure prevents the toilet water shut-off from completely closing.
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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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