[Carl n Susan]

Many of us prefer to do our own repairs - time, cost and skill permitting. Trying to find a dealer and go through the pain of waiting for them is much less preferable than doing it yourself. It is an easy repair and, to be honest, you need the practice as this will continue to fail. Hopefully you catch it before you flood and overflow the toilet (or even the black tank).

The general consensus is throw the Thetford away and buy a Dometic 310 or 320 (my preference).