I replaced the compressor relay and the overload relay. Both items plugged directly into the side of the compressor (which was accessible from the back panel of the refrigerator) and each had one wire connected to them. The fix was simple once I did some research and determined that it was likely the relays causing the problem. This web site was critical to my correct diagnosis: http://www.familyhandyman.com/appliance-repair/refrigerator-repair/refrigerator-maintenance-refrigerator-compressor-repair/view-all