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The two most common problems with solid state pinball machines are blown fuses and bad connectors. A third common problem is leaking batteries that eat away the copper traces on the motherboard. I assume that you have checked all of the fuses. You can try to unplug and replug each cable connection in the backbox. This can sometimes clear intermittent contact problems. In other cases metal fatigue within the connector make for poor contact and the connector may need to be repinned. Also stress on a male connector pin can sometimes cause cold solder joints. Many solid state machines had rechargable battery packs that were soldered onto the motherboard. Over time these would leak acid onto the motherboard and cause issues. If none of these suggestions seems to help then I suggest that you pose your question on an active pinball forum like www.pinside.com. There are many people there that can help you debug the problem.
This machine is based on the Williams System 7 MPU. There are schematics available online as well as debug guides. I don't know how comfortable you are with debugging electronics. If you can't do this on your own you can try to post a request for help on an active pinball forum like www.pinside.com or look for a local pinball repair person. You can either ask for a reference on the pinball forum or search for one on Craig's list.
Gottlieb still protects the rights to all their manuals and schematics so you have to buy them from a liciensed distributor. I believe Steve Young at Pinball Resorce is the only US distributor and In Canada John Roberts from John's Jukes in B.C. is a distributor. You can try either one of them or you could try the pinball newsgroups to see if anyone has a copy they will sell you. Try rec.games.pinball that a good news group with very helpful people.
The reason for this behavior (constantly running but not starting the game) is that the machine is trying to reset to score reels to zero. They may actually go to zero but the switch that tells the machine that they are in the zero position is either dirty or out of adjustment.
It is a very common problem with electromechanical pinball machines. The switches are located on the score reels in the backbox.