www.thetford-europe.com
Improved site with many repair instruction downloads on range of toilets.
One way of testing if it is entering via the top of the cassette door is to cover the door with plastic sheeting tape it on with Duck tape , if it still gets wet it may be the flush water leaking out somewhere.
UK www.thetford-europe.com
Australia www.thetford.com.au
Australia site has stockist list.
FOR UK USERS.
HOME PAGE SELECT ENGLISH {if in Australia forget this selection
NEXT PAGE SELECT CUSTOMER SERVICE (tope line)
NEXT PAGE SELECT USER INFORMATION (left of pic)
NEXT PAGE SELECT REPAIR INSTRUCTIONS (left of pic)
NEXT PAGE SELECT BUILT IN TOILETS [top right of pic]
NEXT PAGE SELECT C2, C3., C4 (or relevant) or select your model
NEXT PAGE PDF Files YOU ARE NOW IN PDF FILE LIST
Bob, April 2009