Matt -
The IDC connectors on the Driver board are notorious for developing faults over time. Moreso for high current applications like General Illumination, but on the occasion, even switch matrix IDC connectors can develop issues.
If you look on the two connectors you have highlighted, you will see the wires are "prized" into the IDC connector housing (J130/J107). The wires can sometimes be prized lose. I find that it if you push in the wires with a fine screwdriver, the connection between the wire and the connector pin are re established. Visually, you can sometimes see the wire in question raised to a higher level than the rest of the wires.
So if you follow my dribble - push in the wire "Pin8" on J130 and "Pin3" on J107. This will eliminate the common fault of an IDC connector issue.
Do you know how to use a multimeter ?
You could check continuity between the wires on the coil and J130 / J107
You could disconnect the coil and measure the resistance of the coil.
