The capacitor tests fine, 1uF at 100V can have an ESR of up to 8 Ohm, the legs however look pretty corroded. My first assumption was that electrolyte leaked out and turned the epoxy conductive. That should show in the remaining capacitance and loss however. Maybe the epoxy became conductive enough on its own. There is epoxy that can get corrosive with time. Would explain the legs. Maybe even slightly conductive?
I'll still replace the cap. Only got .47 and 2.2 with at least 100V rating. Don't think it's critical, I'll take the 2.2

The CRT board is a third party daughter board. Computron 115DMX. Those bastards filed off the label of the controller IC

Got a video signal. So what gives?

There's a floppy drive hidden beneath a flap on the top. I have a policy of checking, cleaning and servicing any and all floppy drives in my machines.
With all the sud that came off the CRT screen, I was expecting a lot more dirt. Basically clean.

It's a Panasonic JU-455-5 double sided double density drive, so 360kB formatted.

The controller board lives directly underneath the drive. It's got a uPD765 floppy drive controller, a
uPD8257 DMA Controller, and a uPB9201 floppy disk interface controller, flanked by 8x8K of static RAM.
Interesting design to have extra RAM on here.