I have been in touch with Thetford with a similar problem. Even had the dealer (under warranty) replace the gasket but the toilet still leaked. By now I was 2,000 miles from my dealership. However, I found a solution for my toilet. If I press the foot lever to the floor and slide my foot off the lever it will snap back and seal. Now I don't know it this has happened instantly or over time but it is working. I haven't been in touch with Thetford since I started doing this so I don't know what they might say about it PS if I raise the lever slowly, the toilet still does not seal.
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