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For some reason the defrost timer was left off of the parts breakdown diagram, but the timer will either be mounted up above the refrigerator behind the service panel where the compressor is located, or it'll be inside the same box as the thermostat where you turn the knob to adjust the temperature for the refrigerator or freezer.
On this model the defrost control is located up top ( remove the top grille ) , near the compressor , held on to a metal baffle by two screws. You can see the two screws and a small hole in the baffle , through which you can see the knob you would manually turn with a flat blade screwdriver to manually turn the control. Part number is ***** , which you can see at www.repairclinic.com
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The service manual shows it near the compressor . If you look at the compressor where the wires go to the plastic cover on the compressor , go up about 10 inches and then toward the metal shield that sticks out . The timer is mounted to the back side of the shield , with the screws holding it from the front side. Hold a mirror up there if you still can't see it.