curious about game king machines

[clizifer]

ok so I have a couple s+ slot machines and the guy I got them from has 3 game king machines. I only looked at the machines very briefly but I remember that they are red and contained several games, poker, blackjack, slots and I think even keno. the machines were a bit taller than the s+ slots, and I remember him mentioning that only 1 of the machines worked. I think the other 2 had dead or broken screens. anyways I was going to go back out and have a look at the machines again on the weekend but im new to the game king and im wondering if theres anything in particular I should be looking for? are these machines repairable and are replacement screens available? also curious what they would be worth? I don't wanna overpay lol. any info helps. thanks