Those don't sound like huge problems to me. I'd check under the play field and see if a wire broke off at the solder point. That's the most common capcom issue. Could be a thirty second fix. Regardless, if this is all that s wrong, I wouldn't see it as a big deal. Maybe it will give you some practice fixing up te game a bit.
Maybe you could talk him down a few bucks. But if you like the game, these issues shouldn't turn you away. That's my two cents. Granted, I live in LA and I'd be shocked to see a PM last more than a day here a less than $2k. So maybe my perspective is off a bit. But it still sounds lie a good buy to me.