The fix was made by replacing the evaporator fan motor. The repair was made quite easy by following the step-by-step video provided for this part by AppliancePartsPros.com. The video instructions show how to dismantle the inside of the refrigerator, to get access to the fan, how to remove and replace it, and put the inside back together again.
This condition had been prevalent for some time and as a result, there was quite a build of ice on the evaporator coil and surrounding parts, as a result of the fan not working. The longest part of the repair was to clean up and remove all the ice.