I can't find a service manual online for it. The original remote is dead too.
I don't think I'd want to risk messing up the tv anyway. Hopefully something can be added to the ports so that overscan isn't an issue. An option to shift the text messages down one line would be enough, for example.
Yeah, that's the tough part about CRT's XD. If you want them to look perfect, you have to dig deep into their guts so that the image looks right for your game console. I have 4 sets here at home: 14", 21" and two 29", aside from 2 17" CRT PC monitors. Most are LG branded, which are easy to enter the service menu, simply by pressing "MENU" on both the remote and the set at the same time. And luckily, one remote works on them all.