Crystal Castles dotted vertical line

[dnaman]

Hello All.

I have finally secured one of my grail games and I occasionally see a dotted vertical pixel type line. It is typically in one of a couple positions and it does 'clean' up with screen draws (I.e., scrolling to new levels etc...)

They don't show on certain screens.

I assume that this is an issue on the PCB, can anyone provide this newbie some direction please?

Thank you