Used U-Tube diagnostic clips to diagnose that most likely problem was a worn Evaporator Fan Motor which is located in the freezer back wall, located in the top third of the unit.
I removed 6 hex head screws from the freezer's interior back panel that covers the evaporator coils. The cover is located in the lower 2/3s of the back wall. Removed all shelving. Also removed screws that held in shelf supports on one side of the freezer wall. I then removed the back panel. You may need to remove the shelf supports from both walls in order to get the back panel out, as the tolerances are tight.
I removed the fan motor which was located behind the back panel. The motor was positioned with the electrical connections facing the front of the freezer. The replacement part was configured so that the electrical connections would face the rear of the freezer, so I had to decide how to get correct connections on the new unit so as not to short the part out. I arranged both the new part and the old part side by side with all connections showing. The resulting left connection on each unit correspond to each other. The same holds true for the right connection2, and the center connections.
Then I replaced all the other parts in the reverse order of how I had removed them.
The work space in my side by side freezer/fridge is limited, and my shoulders are wider than the opening, so I had really contort myself in order to get my hands and tools into the proper work position. I was successful, but it took longer than I would have expected. I would not let the this stop me from performing the repaid again.