i would need a higher res pic the ones you have uploaded to see if there are any cracked solder joints.
if you want to rule out the A/C relay test the following points on the aux driver board, with the machine off and the following connectors disconnected from the ADB
J8, J9, J11, J12
With the multi meter in continuity beep out the following points
Left side of F4 to J12, pin 12
Right side of F3 to right side of F2A
If these beep out fine this will prove that the 50V and 25v A side of the relay and those fuses are ok.
From your fault descri-ptions that you given me (Fuses are fine. Pop bumpers work, sling shots work, all but one flasher works, flippers work, shooter lane feeder works, Flashers only flash at the correct times in test mode)
Either you have 2 wires off (switched solenoids 50V and 25V) on the ADB or the ICB. Or the normally closed contacts on the A/C relay (the A side) are not closing properly. or 2 cracked solder joints on the ICB.
If the ADB beeps out fine then re connect all the connectors and disconnect J7, J8 and J10
Beep out the following
ADB F4 to ICB J8 pin2
ABD F3 to ICB J8 pin1
if these don't beep out fine then try beeping the following with J5 ICB still connected
ABD F4 to ICB J5 pin 11 (YEL-VIO)
ABD F3 to ICB J5 pin 12 (BRN)
If all the above beep out fine then make sure the wires at ICB J8 pin 1 (BRN) & 2 (YEL-VIO) are pushed into the connector properly after you have plugged J8 back in
Let me know how you go
The single flasher not working will be a different fault
