Picked up an Apollo 13 the other day; it has a few problems and was once on a route (maybe 10+ years ago) but has been sitting in a dude's house for a good long time with no attention of note. Amazingly it had ZERO leakage from the (still mounted!) battery holder despite my suspicion that the guy who owned it never used the key in the coin door! It's getting a NVRAM since it's a socketed chip on these and it's a 30-second job.
Playfield is in good shape and a half-day with it got it mildly cleaned, 3/4 relamped with LEDs and the mechanical issues fixed so it's fully playable. The moon and rocket both work after a bit of attention although someone at Stern needs to be attached to a tree; 4 flashers (2 in the rocket and 2 in the backbox on that channel) is 2 too many on the stock power board transistor and one channel is blown. Waiting on some TIP102s (I was out) to take care of that and bayonet-base LEDs to fix the dissipation issue "for good." This is a game that punishes you *very badly* for missed shots (usually with a SDTM) but it's growing on me rapidly (the kid loves it, including the frustration level it generates.)
It'll get the full strip-down, clean and rebuild flipper treatment soon once I have all the rubber parts I need -- I'm missing too many of them to want to tear it apart twice for a full cleaning, go-through and re-rubber treatment.
I'm a Bally/Williams sort of guy but this isn't a bad table at all...it has exceeded my expectations thus far.
I'm now officially out of room for additional pins unless I invade a second room.... which is kinda likely to happen