first I looked into the refrigerator for blockage of air flow.
none found, I looked into the freezer area to see if fan was working ,it was, noticed ice built up on the outside of the metal cover letting me know it was not defrosting ,It was easier for myself to pull freezer door off , then the ice-maker,only three 1/4" hex head bolts,two 1/4" hex bolts only holding the metal cover . The quickest way to defrost was using a blow hair drier .once it was all defrosted I disconnected the defrost heater and using a volt/ohm meter,I ohm out the element,finding out I had no reading .The one thing I forgot to mention, unplug the frigertor first !!!