I am looking at purchasing an original WOZ which was probably built in 2014 or so. Price will be somewhere in the low $7's. It has had a couple of light boards replaced, but nowhere near all of them, which I assume are probably the original (faulty?) design.
My question - can these boards be repaired if they fail? I assume JJP will not stand behind them on a game a few years old, and since I would also not be the original purchaser. I am concerned I might pay a fair price for the game, only to have to spend a great deal more money if/when light boards start to fail. If I end up eventually spending nearly $10k with repairs, I might just as well go out and buy a brand new game with the later revision boards. What's the consensus among the JJP repair gurus?

The game I am looking at is a standard version, but with a few mods such as invisiglass, etc. I though I read somewhere that some of the light boards could run several hundred dollars each, and that there are 15 or more individual boards, but maybe I'm mistaken. I just don't want to look at worst case having to spend a thousand or more dollars with potential light board failures. If that were a possibility, I think I might just get a newer game.

Are the boards easily identified as to whether they are 5v or 7.5v?

I'd be tempted to go nib, but jjp website says nib standard is 8500 plus tax and shipping. That's a lot more than low 7's!