Quoted from Its_me_aj:I was able to snag a few pics of my mystery wire. It looks like it could be white/green?
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It is white/green. It is for an extra chime. The J-2 connector is 15 pins with pin #1 at the top. This w/g wire goes to pin #11 which is open in your connector.
A3 is the designation for your Solenoid Driver Board. It is connector J-2. Pin 11. Reads as: A3J2-11. Leave it disconnected until you can find that chime. And down by the chimes you should be seeing the other end of this w-g wire. Yes?