Hey Jake, can you please point out pins P2-6 & P1-2 on the pic? Thx -Yes, you will need a multimeter to check if your getting proper voltage to the ice maker fill tube heater. I'm attaching your tech. data sheet below.
Do Service Test - 19 Ice Maker Fill Tube Heater and Facia Heater Status
--->Control the Ice Maker Fill Tube Heater and Facia Heater selecting SW3 (toggle between On and Off)
(01 = ON, 02 = OFF)
On the main control board, located on the back exterior wall of your refrigerator, take a voltage reading on P2-6 to P1-2 when you toggle it On. 01 = ON.
You should be getting 115 volts when its 01 = ON if you DON'T get 115 volts, then your main control board is the problem.
Here's the main control board for your model:
WPW10589838 Electronic Control Board
Plus you get $60 credit on your credit card when you return the old one.