[valleyer]

I have one that still works fine today (except for removing the notorious RIFA film capacitors, but those didn't fail after "a couple years").

[Hatrix]

oh, ok, so if you search for Apple technical service bulletins from 40+ years ago you won't find anything about troubleshooting the various problems.

[ssl-3]

Does the presence of troubleshooting information serve as a valid indication of widespread issues?

40+ years ago, it was very common for manufacturers of consumer electronics to have service manuals available for every model of everything, from table fans to microwave ovens to Atari consoles.