i'm sure it's the middle leg where there is another wire going to it.
basically the patch wires are only relocating the transistor from the board to a heatsink for better cooling.
the other hole from the board goes through another patch wire to the resistor and then back to transistor with the other green patch wire.
i had the same problem where the solder wasn't quite right, it lit up an LED but not good enough to move the valve.