I'm not really sure, I wasn't as technically inclined 20 years ago as I am now. I did a lot of trace testing before an after recapping. Under 3 of the caps was obvious leakage, very small and confined to the area just beneath. By no means am I saying your wrong, I have seen some nightmares inside of Sega Genesis/ CD units (notorious for bad caps an my fave retro game console). One of the pads had also lifted but I did find a solder point for it. All was tested for continuity. I'm confident the issue lies somewhere else an I'm continuing with the RAM testing.

I really haven't had a chance to get to the video card, had to track down a vacuum leak on my car but with that fixed I'm back on this.