Picked up this set from a local collector, who shot this video. I've never seen an issue like this before, take a look:
https://www.youtube.com/watch?v=nGyboqrG8ic
Swapped vertical boards out of another set, and that's not it. About all I can think of is a regulation issue. There's a 470 uF cap on the board which I've heard is problematic, so I'm going to replace that.
Before I finish up my Mouser order, any thoughts or input?