GE Refrigerator Main Control Board Wiring Schematic

How can I obtain a wiring diagram/schematic for the main control board on a GE Refrigerator Model# PFS22SISBSS? I am trying to run some diagnostics on several components including the defrost heater(s) and thermistor, and need the schematic for the wiring harnesses and wires connecting to the control board. Thanks, Carey

Check behind the encoder control panel.