4600 monitor flashing or streaking

[popcorn1]

I'm not sure what to call this symptom, flashing or streaking, but I brought the monitor in dead, installed a cap kit and now I see it flashing and streaking. Despite what the phone camera shows, the picture is pretty good when it shows one and really bad when it doesn't.  It does this on the bench and in the game.

I have worked on all the solder joints and cleaned all the pots. The Cap Kit came with a brightness pot for the interface board but this chassis didnt have that type of pot so I couldnt install it. Should I be converned about the edge mounted pot as well?

After resoldering everything in sight I seem have it where while I didnt see anything even remotely obvious wrong, I haven't seen it do this brightnes flash for a hour, but if I tap on the deflection board I can make the monitor jump a little so I'm not sure I have all the bugs out. I have poked around the deflectiom board with a plastic tool trying to locate what is loose and can't. I'm suspecting the edge connector but it "looks" as fine as any I have seen.

I'm looking for ideas...