So my Gorgar kept blowing f2 fuse and locking up. I did the ground mod as suggested by by a service bulletin. That has solved the fuse blowing and lock up issues.
Now when the game is turned on when cold the pin goes into attract mode, kicks the ball into the shooter lane and then all displays go blank and I cannot start a game. Turn the power off and back on and everything is fine. Plays all day after the second power on with no issues.