Refrigerator cooling fails to come back on after defrost cycle.

Since the defrost timer turns the cooling functions on and off for each defrost cycle if seemed the most likely problem. That was confirmed by manually advancing the timer with a screw driver and the cooling functions would resume and run until the next defrost cycle (every 8 hours or so). The repair itself was to swap out the timer which took five minutes with a #2 phillips screw driver and a 1/4" nut driver. Once the timer was removed from the cover plate there's a simple plug-in connector to remove from the old and plug into the new timer. Two machine screws hold the timer in place behind the cover plate. Be sure switch the power off on the compressor cabinet before removing the cover plate.