A dealer may tell you that because Thetford no longer makes or supports the toilet, the problem cannot be fixed. He will then suggest you spend $1000 having him install a new toilet of a different kind.
If you are handy, and motivated, you can remove and reinstall the Thetford yourself, using the instructions in the previous post. When you do so, be sure you don't misplace any parts. The wax ring (actually more pf a foam donut) that Shane mentioned is standard among RV toilets, and so is easily available and costs only a few bucks. The white clips (wedges) that he mentioned will be difficult to replace, so don't lose track of them when you pull them. The seals for the slide valve will also be tough to find, though you may be able to disassemble the valve, reset the seals if they have gotten wrinkled, and re-assemble. Be sure you post here on the Forum about what you need. A number of members have replaced their toilets and kept the old one as a source of parts.
If you decide to replace the toilet, there are a number of threads here on the Forum that will help. Some of them cover installation of a cassette toilet. Others describe installation of a Sealand M-28 toilet. A Search will uncover them.
There is one other possible though unlikely cause of a leak. Over the years, we have had a few instances where the plastic body of the toilet has cracked. This has usually happened where the seat rests when it is down, but I suppose it could happen anywhere. A quick examination should let you eliminate this thought.
Bill
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