Operation restored! I peeled off the old tire and silicone and redoped it in Permatex Ultra Grey. Were makin' a good picture now. There is some arcing in the HV rectifier socket, but I'll clean that later. I also picked up a newish HV rectifier tube socket at Surplus City.
Another weird thing is there was some big arcs between the HV anode lead and the HV rectifier filament on the back of the socket (before I got it cleaned up) and it appeared to short out the colorburst tube, I swapped it and the color came back.