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I wish my update could be more definitive in what my problem was and how I solved it. Certainly all the tips here helped quite a bit.
I have some experience with electronics and I like to think that I would recognize a cold or failed solder joint if I saw one. When I went back in, all the connections looked real good and clean. This time, I had the guitar hooked up to an amp to that I could wiggle the wires to see if I could produce the problem--I couldn't. Everything was working fine.
I did observe that the wires from the neck PU were routed directly (and closely) over the middle PU. I also observed what looked like solder "splatter" on the black wire from the neck PU (about where it ran past the middle PU). I removed that "splatter" by flicking it off the wire and then reassembled everything while paying more attention to how the wires from the neck PU were routed.
Everything has worked fine since. I've reflected back on the splatter and I'm guessing that instead of "spatter," it may have been a flake of solder from the middle PU that pricked into the black neck wire and then broke off attached to this wire. Although I did inspect the wire after flicking off the solder, it is possible that there was a very small breach in the wire's insulation (rather than the solder just laying on the insulation) that I did not see that, in fact, produced a short when this solder touched something else. Then when I tapped my guitar in the right place, I effectively moved my neck PU enough (and the wires attached) to temporarily break the short--only to have it come back after more guitar movement.
So that's my theory. I'm not going to dwell on it much more unless the problem recurs.
Regards to all.
Mark
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