Hello, I've been trying to figure out this issue for a while, and am hoping someone else may have some idea of what best to try next.

Here's a video of the Game started:
https://photos.app.goo.gl/V2Rpg5cij8BLDNLH8

In attract, the lamps from Col 3 are stuck on but flicker a bit. In gameplay, per the video, they cycle as if they are connected to the red arrows (col 4?)

When I swap the col 3 and 4 connector from the board to the PF, I basically see the same issue on the red arrows and the col 3 lamps seem fine.

While trying to isolate the problem, I have updated all of the lamp columns Q67 etc. to mosfets to reduce heat in that area. I did pull the small transistor (Q66) and it appears fine also.

Wondering if anyone has seen this before and has any more direction.

I am guessing the Lamp column and Blanking ICs might be the next thing to investigate.

Thank you for your time.

-Koji