Tossed the 5V4 on the tester, and it was perfect, so I got to thinking of what ELSE might cause the damper tube to be out of circuit. Peered underneath, and why HELLO Mr. Capacitor!!! Apparently something came loose from the previous tech that did the work! Yay!
Problem solved, right? Nope.
Clip leaded the cap across what I figured was a very obvious connection as seen in the pic. Powered it up and heard a SNAP. Shut it down. Grr.
The one end of the cap is definitely at pin 3 of the octal socket that goes to the HV chassis. It's a .1 uF. Have to do some tracing to figure out what the devil is going on.....