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Looks like your HV is fine, so no need to check the HV oscillator. Right now I'm suspecting scenario 1a in my post above (copied again here):
1a. If the grid drive on just one of the two triodes is too weak, it could still cause this problem. One way this could happen is if there is a problem in the network that feeds the inverted signal to the second triode (grid = pin 4). Can you confirm that C65, R65, R64, C67, C66, and R62 are all correct value and good?
Also check for any possible wiring mistakes in this area (in case you accidentally made a connection wrong on a replaced part. Check against schematic).
Since you're showing such a low voltage on pin 5, I have a hunch that the grid to that triode (pin 4) isn't getting a proper drive signal.
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