Send e-mail to robertwhiting76@hotmail.com [me]
I've helped so many on this subject I've compiled 3 attachments. 1. Repair/replace pump
2. Microswitches 3. Exploded view ans parts list.
For the record www.thetford-europe.com but if you ever contact them if I can't help then don't hold your breath for a quick reply, or a reply other than 'take it to service engneer'.
Bob, January 2009