You nailed it! Would have blown right by that in my rush to get to the A32 board to check the +5V supply! So, articulating it a few times brought the lights back. Talk about feeling really dumb!
Well, that gets me back to square one but with a little more knowledge than before. The individual B SOURCE TRIGGER lights don't work but I have reason to suspect that it is the +5 lights connection to board 14. One rainy weekend, I will tear down the front and poke around with a probe but, for now, that's good enough!
Sincere thanks! As good as the service manuals are, they do not seem to address these trivial problems in a readily researchable manner.
"A friend told me to cheer up, things could be worse.
So I cheered up and, sure enough, things got worse!"