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Got back at it today and I think the HV control is bad. I studied the schematic for a while and decided to check all the resistors in the regulator circuit, then check voltages. All the resistances came out fine except the HV adjust pot.
Schematic shows that it's a 1 meg. It measures 1.1 meg end to end, so I think that if I center the control, it should be half that from the center to either end, but it measures 1.1 meg from center to either end. If I vary the control, resistance starts rising to 1.3 meg, then drops to about 130 ohms from center to either end.
I have a good feeling replacing this will finally take care of the excessive HV. Now to try and find a replacement.
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