I had a similar problem with our original Thetford toilet. I cleaned the seal as Carl suggested and put in some Thetford Seal Conditioner and let it sit while the rig was in storage for a couple weeks. No problems since. I got the seal conditioner on Amazon.
https://www.amazon.com/Thetford-Toil...NsaWNrPXRydWU=
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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