I have been cleaning (no adjustments thus far as I havn't needed any) my machine and after getting the scoring motor working to eject the ball from the drain to the shooter lane. I have been checking the game play. When It first started it was playing 3 balls (at least that is what it is currently set for), but now when the fist ball goes into play, the counter moves immediacy from 3 (when button start) down to 2 which I think is suppose to (Balls remaining) but more so than not the first ball plays, the second ball plays but when the second ball goes into play and drains, it goes to game over. I disassembled and cleaned the ball counter and for a while I could push in on the contactor and it seemed to work (3 balls, 5 balls if selecting 5 ball game play) but now regardless of what I do it plays 2 balls then game over. Any suggestions on where to look? Also I can't seem to find a schematic for this machine.
Link to a video showing the issue.

got the schematic now. Thanks Pinball Resource! I have cleaned the ball counter inside and out. All the contacts are good. I can't find a "Tilt" relay on the schematic so I am not sure where to look next. 2 to 3 scoring relay? where are those located?

Well as it turns out it was the game over latch relay one of the contacts was bent, but now the start game button is not tripping I have available games and if I manually trip the game reset it all works as it sued, I just cant start the game

Oh why because that was what it was?

Here you go!

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Well after getting my new coin door and cleaned it up re-adjusted everything I found my issue. The game start relay had a bent contact leaf that was not closing. AND I had a single leave on my scoring motor that was not closing all the time. After adjusting those, it worked! However I then had an issue that I dropped a quarter in, it counted off 3 credits instead of two, after observing the credit counter, the solenoid did only engaged twice, but registered three credits, I remembered that I took that unit apart and cleaned it, and I must have not put enough turns on the clock spring, so I wound it one more time. BANG! That did it, t here was not enough tension on the spring and the force/momentum of the solenoid engaging the clock wheel. So now I just need to rebuild my pop bumpers and do some adjusting on the other reset actuators and I think I have this thing complete! I do still need a 15/16" ball for the tilt rail, and a couple counters for the play/replay counts (Again someone who had it before me ripped them out )