Sorry for the slow reply, but better late than never, right?
Is there any solder on the right pin of that switch? Doesn't look like there is, and that would of course make it not work.
It's not a friendly PCB design but looks like there's a trace going from that pin to the left pin of the switch above, and the left pin goes to D177 below and left. If you touch a piece of wire between the two red dots it should press the left arrow - if it does you can solder wires where the blue lines are and it will work. Unless your replacement switch is defective...