I used google search engine here in UK and found that they not only have dealerships in Australia but also NewZealand. The Australia one email address is
info@thetford.com.au
If no joy try www.thetford.com and email them for details. Good luck
Give ya a tip before taking anything apart no matter what take a digital picture of each stage of opps and if you have problems or spare parts over on re-assembly you can see where you've gone wrong by the photo's.
Bob
August 2008