Space Invaders Black & White Monitor Rebuild Help Needed

I still keep getting these quick white flashes on the screen. I ohmed both the contrast and brightness pots. Contrast seemed good but the brightness was a bit flaky so I swapped in a better one (not perfect) from a spare chassis. Still getting the flashes. I'm going to check Mouser for new pots but not sure if that is the true problem. I recapped the chassis but not the filter cap yet. Not sure if that is the issue either. The focus is still a little fuzzy as well. When the screen flashes white, there are areas that remain black and the game images remain. This is a known good PCB from my SI Deluxe.
 
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