Here's a closer look at that blackened corner.
My first thought was the filter cap had gone bad and the 18 ohm flexible resistor going to it had fried. Nope. I removed it and it's fine.
35W4 tests fine as do the other components in the immediate area until I rotate this cap around. One end breaks off and I see a charred interior.
It must have really smoked when it failed!
I'll try cleaning up that area using some QTips and alcohol.
I had been considering restuffing the paper caps until I tried melting out one of the SEALDTITEs. They're not the usual paper tube sealed with wax.
More like a hard resin tube with a paper label. Smells horrible when melted
So, I'm just soldering in new caps. Should be ready for a powerup tonight.