Fuse looks good. Continuity across and 120V measured on both sides when powered.
More digging required as everything on the high-voltage side seems groovy.
Thanks @croissantking , I followed the strategy in this video: (Basically using a flat-bladed screw driver, smacking, and working around the case. Not the prettiest, but it did work.)
Also, thanks for the pointer above. I was able to get the shield out of the way -- was surprising to find that...
I’m trying to recap a M1893 which looks very similar, but with a massive soldered-on heat sink on the bottom that’s preventing access to the underside of the board — and the bugger doesn’t want to budge. There are apparent solder points on the underside of the board, but solder wick hasn’t quite...