It's finally time to reinstall the main board. Hopefully, I won't need to pull it out again anytime soon.
I popped the HV cage off to get a closer look at the flyback. Some chunks of insulation have fallen off, but the resistances match the schematic.
I picked up some RTV133 silicone to patch it up.
I wonder why the 15 ohm resistor has been shorted out
It's R72 on the schematic.