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Use the HV probe to check the B+Boost, or a VTVM. Most DVOM meters do not measure a high enough voltage. I use an RCA Senior voltohmist VTVM on the 1500 volt scale. Boosted B+ is used for the high voltage side of the screen controls and the vert height and vert lin, as well as horizontal centering.
If the 13K resistor that is in series with the 47 ohm resistor has drifted high it will cause the HV to be low. You may have to raise the HOT cathode current a little. Maybe to 200ma. Lower is better, but it must stay under 210ma.
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