While I agree that such repairs are not for everyone, I think it's also a mistake to assign "God like" powers to someone just because he works in a repair shop. I've gotten plenty of really bad repairs at factory authorized and trained repair shops, it's the way it works many times.
I think the replacement of the carbon rollers is well within the capabilities of folks that are handy with basic hand tools and is willing to ask for guidance. Look at some of the very complicated layouts that are built and displayed here, there's a lot more places to have a fire in a large layout than rebuilding the transformer.
I think our mission should be to assist folks in such tasks and not try to convince them that it's over their head.
