Years ago, on our 2010 I did everything you did and even had Tetford replace the toilet under warranty. Finally junked it and installed a Dometic 310 (320 wouldn't fit on that model) Since then we've had the Tetford removed and a Dometic installed before we took the new rig off the lot.
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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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