I appreciate the help guys however I found it. In the hopes that someone else may search someday and have a similar issue - it was loose pot wires where they meet the board. I think used too big a drill bit on this particular PCB while I was waiting for replacements. I bet it was sympathetic noise induced by the vibrations of my "rocking before boxing".
Needless to say - now I am extra careful, i use 0.8 mm (as I do for everything) and secure the 22AWG Teflon Silver with a few dabs of hot glue for extra security. If the wire doesn't go into the pcb, I take it by hand and use the bit to carefully enlarge the hole just so the wire is a snug fit.
Needless to say - now I am extra careful, i use 0.8 mm (as I do for everything) and secure the 22AWG Teflon Silver with a few dabs of hot glue for extra security. If the wire doesn't go into the pcb, I take it by hand and use the bit to carefully enlarge the hole just so the wire is a snug fit.










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