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Check connector J1 on your solenoid driver board. If the connector is ok, your pins in the header might need to be re-flowed. The solder joints can be bad on the back side of the board. Look at positions 8 and 9 on J1 they are likely the reason your flippers are not working.
Here is a picture of the back of a solenoid driver board that needs the pins reflowed at position 8 and 9 of J1. The vertical row of 9 solder joints is the backside of the J1 header. Zoom in close to the bottom two solder joints (these are positions 8 and 9) notice the cracked solder joints around the pins. The cracked joints will cause flippers not to work. If your solder joints are cracked re-flowing these pins should make your flippers work.
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Elkhorn, WI