These voltages found on transistors on the HV PCB of a working monitor.  Voltages taken on a 19 inch monitor running Asteroids in attract mode.  Meter used was a Fluke 8010.  AC input 116 VAC.

I would expect normally operating monitors to show variations as much as 10 to 15 percent; the key is the ratios of voltages and being sure that the B-E differences in the transistors are correct.

DC readings on Q903 are undoubtedly skewed by the relatively high frequency of operation of this transistor and will vary from meter to meter.