I couldn't do it by myself, I had a lot of help from heaps of guys, especially Ralph in SA.  He spent a few hours on the phone with me and led me to the fault.

Have we as a group got a collection or database of schematics something along the lines of the DVDs that are floating around?  Something like that would be a great help at sorting some problems that pop up from time to time.   

I was pretty disappointed about not being able to fix it myself but thanks to everyone I learnt a fair bit about the machine with this fix.