The situation... note that the thermistor was in the correct location. This was after 30 minutes defrosting the outer case and some time heating the coils directly. Notice that the entire top of the evaporator was covered with ice preventing any airflow over the coils. My previous defrost attempt to melt the ice with the plastic cover in place was entirely ineffective.
Note that to take off the plastic evaporator cover you MUST remove the vertical air vent that runs to the top of the frig, and to that you MUST remove the plastic ceiling. That is described here:
Don’t be afraid to pull down hard to separate the snaps.
The small water filter electrical connector is particularly difficult to separate. I needed an extra pair of hands to hold the ceiling while I pried the miniature connector lock with the tip of a pointy knife while pulling the connector apart.
The vertical air vent is snapped into the rear of the frig with 3 pairs of clips that are easily separated. Then, with the ceiling removed you’ll need to pull the left upper corner free that is slightly trapped by the ice maker housing. Once the left upper portion of the vertical air guide is free then everything comes apart easily.
20hr later my frig is at 36F and my ice maker is filled. I checked the programming and the defrost mode remains at the basic 8hr setting (not "ADC".)
Right, so when you notice that fan motor NOT running and the coils are frosted over like in your photos in post #62 you will need to check to see if your getting any voltage to the fan motor, if so and its not running, then replace it.