I always learn the same lesson... I am a moron.
Just yesterday, I spent over an hour fixing a problem on my 1957 jukebox. Assumed it was one thing, then another, then something else. If I had simply looked more closely and thoughtfully diagnosed the problem, I would have seen it and corrected it in about 5 minutes. You know what they say about assuming...unfortunately, the only one that is the ass is me!