Could be a faulty back flow preventer which for many is under the bathroom sink. If not check connections behind the convenience center. If that doesn't do it, then you will have to remove the panels underneath and so you can see where it connects to the holding tank.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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