The defrost timer could be stuck in the defrost cycle,its the number 12 in the breakdown .Replace the defrost timer it should fix the fridge not going problem.

Yes its located behind the light in the fridge section.

http://www.partselect.ca/PS2065577-Whirlpool-67001036-Defrost-Timer.htm?SourceCode=5&SearchTerm=ARB2517C&ModelNum=ARB2517C

1. • The disassembly process to access the defrost timer in an Admiral refrigerator is so simple that it requires no previous experience or specialized tools. Open the refrigerator door and remove all of the food from the top shelf so that you can easily access the light bulb housing; in many Admiral models, this is where the temperature control panel is located. Pull gently on the edges of the light bulb housing to remove it; set the removed housing aside.

     • Providing Superior and Complete Hands-On Appliance Repair Training

       Defrost Timer

   • Examine the refrigerator components that were exposed when you removed the light bulb housing. Locate the defrost timer on either side of the refrigerator light bulb. Look for a black squarish plastic component that is about the size of a deck of cards; this is the defrost timer.

   Troubleshoot Defrost Timer

   • There is a small slot on the defrost timer that is just large enough to fit the tip of a flat-head screwdriver. Insert a screwdriver into this slot and turn it to the right to advance the timer. Listen for a distinct clicking sound that indicates that the refrigerator's compressor and fan are turning on. Replace the defrost timer if you hear the compressor and fan components turn on after advancing the timer with your screwdriver.

if it did not cut in by advancing the timer the part to replace is the thermostat number 8 in the breakdown, unplug the fridge and join and tape the two wires together now plug the fridge back in if it kicks on replace the thermostat.

http://www.partselect.ca/PS2067078-Whirlpool-67003000-Freezer-Temperature-Control.htm?SourceCode=5&SearchTerm=ARB2517C&ModelNum=ARB2517C

This is the thermostat to be checked , if it starts up by joining the two wires replace the thermostat.