Quoted from Murph74:
Right now, the voice has died but sound effects are working. A few bulbs are out (right side 2x, extra ball are the ones I've noticed).
Hey man, welcome to the club! Sounds like your machine might need a serious makeover, but that's part of the fun!
The voice dying could have multiple reasons. The voice IC that Stern used is not the strongest one. But: it might also be a fuse.
Does your General Illumination (GI) work? This is the illumination that is supposed to be on constantly, mostly found underneath plastics and behind the backglass. If none of the GI lights work, the fuse for the GI might be bad. Don't ask me why, but the voice card of these classic Sterns is on the same fuse as the GI is. So if the voice ánd GI are out, chances are that this fuse is the reason.
The fuse is located inside the cabinet, on the Power Supply board. You can see this board in the 6th photo of the second post in this thread (the one with the cat inside the machine).
If the fuse for the GI is indeed bad, make sure that you use the correct value to replace it. There is a reason that the fuse went bad in the first place, and you don't want to stress components by overfusing. The value that's supposed to be in there is written on the board, next to the fuse. If the new fuse goes bad after turning the machine on again, you probably have a short somewhere.