Make sure you unplug refrigerator before beginning work on refrigerator.
Remove the 28 mm screw holding the thermostat to the refrigerator using the JIS #1 screwdriver
Carefully remove the thermostat knob.
Carefully slide off the thermostat towards you.
Once the thermostat is removed, take a picture of the cords (still connected) to help with reassembly. Then proceed to disconnect the wires.
Remove the three cords on the front side of the thermostat by simply pulling the plastic connector off for two connections and doing the same for the metal connection. Do the same to the back side, disconnecting another plastic connector and then remove the thermostat.
Replace the old thermostat and reassemble the new thermostat using the picture that you took before to properly connect the wires.