You know, I've always been in the camp of "replace all electrolytic caps even if it's only preventive, but lately, I'm not that sure anymore.....
See, some of my monitors are SO good, they look like brand new. F.I. the Sanyo 20C (this is even older than the 20EZ model! ) in my Nintendo cap looks brilliant (Ok, I replaced the "fold-over" cap, but this one is RIGHT next to a transistor heat-sink).
Also more recently, the Berzerk machine has a G07 that looks like new after cleaning the screen and bezel. And it HAS been run quite some time because there _is_ some burn-in on the screen. I have no jitter, no shake, no bars, no weak colors, very good focus and convergence (although that has nothing to do with caps).
But all caps are original. And actually, I'm not going to cap-kit it. I decided to leave stuff that is working 100%.
I also did some measuring on power supplies with very old caps. There was virtually no ripple on them and ripple is what you should get when electrolytic caps start acting up.
I'm still in doubt though. I'm not saying it's all nonsense and I've seen plenty of bad caps after all those years (even on game PCBs). But I'm just getting some doubts wether it's _always_ a good idea to cap-kit monitors and other stuff.