How to further troubleshoot a refrigerator freezer not working.

How to further troubleshoot a refrigerator freezer not working. I have a 14yr old freezer on bottom Amana fridge that suddenly stopped working. Both the freezer and fridge section are 61 degrees. The ambient air temp is 70 so it is a "little cool" but nothing stays frozen. It stopped working 2 days ago and now everything is melted.