Whoops…..the FET's have been installed wrong (reversed!)....turn them 180 degrees (if they are still alive). Besides this, using 0 Ohm resistors to replace the 27 Ohm base resistors is dangerous. Replace them by 1k resistors. This prevents the 6427 darlingtons from exploding when things go wrong with the FETs. (It is better to apply the modification with the voltage diver here).

Also….this driverboard comes from an older system 3 game as there are 1k series resistors installed driving the switch matrix. For system 7 games like Black Night, these should be replaced by 0 (zero) Ohm resistors.