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If pin 3 of the hot is the screen grid as I suspect then it being low indicates excessive screen current.
Excessive screen current occurs when there isn't enough plate load. If the damper is weak or open the screen should say like that (it will be worse if damper or H out plate lead is open). Or if circuits that normally load the flyback are open or otherwise not drawing sufficient current (even a detuning in the yoke or other resonant circuit could cause this).
The flyback is probably OK...If the flyback had shorted turns the H output screen voltage would skyrocket above rated voltage. Basically the cathode emissions is split between screen and plate (the vast majority to plate). So if the plate takes less of the fixed cathode emission the screen takes up the slack, but if the plate takes more the screen gets less.
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