Nowdays, when replacement supplies are on less of an availability, repairman should be qualified engineer in order to find proper solutions for repair. That is very frequent case when you have to match parameters, reorganize circuit board for equivalent circuit elements of different shape and size. Fisher 500 repair took GUTS out of me till I figured out how to replace single chassis capacitor bank with the equivalent circuit and fit it in!!! I did that as a hobby, but now it would only be waste of my time unless I retire to work on that full time which is unlikely to happen.
Also many of those are not alive and their children if any I'm sure were going to the school that only has an illusion of an education.