The refrigerator would cool for about a week then quit If you turned it off for a day it would work for another week.

I took the cover off of the evaperator in the back of the freezer compartment and thawed the ice out with a heat gun. I then replaced the bimetal defrost timer I did have to change one connection as it would not plug into the harness.
I found the Defrost timer in the front of the refrigerator behind the filter cover at the bottom. Just one screw and a quick plug in and everything is working wonderfully. no more icing up