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See if there is any places that might be draining off the HV. Ceramic cap C142 could be leaky. Check the resistors around the horizontal output. Measure the HOT voltages except the plate cap.
I wonder about the accuracy of HV probes but yours wouldn't be off that much.
Make sure the outer coating of the CRT is grounded, it forms a filter cap on the HV (along with C142).
You might check the adjustment of the horizontal drive C136B. Do not use it to adjust the HV however, you could damage the HOT that way.
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