All this "solutions" are not for any camera bodies. My Minolta Cannon and more, have this problem, but nothing can be done, the rubber layer of it has oxidized. And it is impossible to clean this or remove the layer. Just designers did not take in account these consequences of having the camera for 40 years.
Nice, :) I have older or newer model with Resistor (functioning as Fuse) F1 burned will check what is it connected to, probably heating and or other generally AC supplied parts… and power supply to rectifying bridge and further. Pity I can not attach a picture of board.
The company to prevent repairs did clamp slide connectors this much that it was easier to tear out them from PCB than disconnect. Shame of them.
Anyway I am close now to start diagnose/troubleshooting, but searched long time and did not find D8 on your board, nor on my.
It looks very similar, with different shape and positions of the same elements.