Help please.

I'm getting this error code on the displays when the game boots. This is a Blackwater 100. Any ideas or help tracking this error down would be appreciated. The LED blinks normally then on the 9th blink this shows up on the displays. GI is on . This is a 6803 MPU

failed Test 9 zero cross A

Just before this happened the game played good but I noticed is the the drop target bank coil was stuck on

Thanks
Scott

Failed Test 9.JPG

So looking at this today I now see that the FU4 was blown on the power module. When I replace it it blows almost immediately. Still looking for some suggestions
Thanks

So one of the lamp control lines was touching the metal PF support bracket that rests on the lockdown bar received on the cabinet causing a direct short. I ground a radius on the bracket to add more clearance and the game is back up. Previous owner had moved the bracket because of stripped mounting screw holes. The Zero Cross A error code on the displays before this was fixed was pointing to the signal name ( red Wire) that was being shorted.

100_0478.JPG