Phill,
I hadn't picked up from your posts that it would run for a while before faulting again, I read it as though it would not work at all. The capacitor issue is called 'forming' or in this case 'reforming' it's always been an issue for quality stereo system amplifiers too.
Have a read at this post, I put a link in there about it.
http://www.mycncuk.com/forums/router...pping-rcd.html