Great the problem is located!
Remains the question if also the root cause was a faulty degraded fuse, or is there a real electrical issue in the circuit the fuse guards?
Was the blown fuse the disease or a sympton?
Kind Regards,
Bert
I was checking various unused connectors for a 12V feed using a multimeter. I guess it is possible that I shorted out two wires that resulted in a blown fuse: I'm not certain.