Quoted from RoyF:
I'll remove the board and reflow the male header pins. Will report back results tomorrow.
If I need to replace the transistors, what are they (may have some from pinball parts supply), and would I need to discharge the picture tube in order to be able to safely work on replacing the transistors?
Are you thinking of caps? It could probably benefit from a cap kit and not an overly complicated job.
Maybe do the flyback too while you're in there. It's not that much more to the repair.
Yes, you should discharge the tube first. Ground a long screwdriver and have fun with the "crack". It's a thrill. (:
Screen collapse is a fairly common problem in the old arcade monitors.