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Measuring the rec tub cap when powered on was only possible because there is no AC going thru the fly, only DC that feeds from the Damper tube (6W4?)
Try this with Power off ; What is your resistance measured from the horizontal tube cap to the HV rect tube cap? Should be about 500 ohms or what the sams lists. Its probably OK, since you got DC there.
Then this: Lift the 6CD6 hor out cathode pin 3 off ground and put an ammeter between that pin and ground. Leave it there and start trouble shooting the output and oscillator stage. If you have -99 volts, the tube is probably completely cut-off (not conducting)
My guess FWIW is that the horizontal oscillator is way off frequency. Start there. Check everything. Disconnect AFC circuit in case sync signal is causing issue.
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