Maybe this could help?
"7. When 'DB' relay is in a setup position, the motor continues to run and all score units reset to zero through motor 1A, motor 4A, and the reset control switches on 'DB' When all score units are reset to zero and motor 2B switch makes, 'DB' relay is tripped completing the reset cycle.
8. Place the ball in the out hole. When the ball makes the outhole switch, 'O' relay is actuated through a normally closed switch on 'DB'.
9. 'O' relay locks in through its own switch and a switch on motor 2B.
10. When 'O' relay is energized the motor starts running.
11. Motor 4C actuates the ball return coil through a switch on 'O' relay.
12. The ball return kicks the ball across the trough switch which steps the ball count unit once, indicating first ball in play.
13. The ball is now in the runway and ready to be shot onto the playfield."
It's for Flying Carpet, also a 1972 Gottlieb, so hopefully close enough to apply. If there is a DB relay on the reset bank of King Kool, then I'd check it for a dirty/misadjusted switch.