During attract mode, the three pop bumpers and both slings will lock on and blow F104, and do a hard reset to the game. Not as soon as the power is turned on either.
LED 2 is always on the driver board, and LED 3 begins flickering, and then the game resets.
Did you do some repairs recently that involved disconnecting a ribbon cable? If so, seems might be plugged in one row off.
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Toronto, ON
Fultondale, AL