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I figured it is the problem also because it is the only common element to both the refrigerator and freezer cooling (I believe this unit does not share interior coils, only the compressor). For the thermisters to fail in both freezer and refrigerator at the same time is very un-likely. Compressor runns so I do not suspect the starter unless there is something quirky that allows it to start initially but not later by commenads from the refrigerator.
My only hesitation is that most internet posts from online advice or AFTER the technician has left is that the fix does not work. This my be 10% of those with the problem or 100%. I do not know. The successful fixes are not posted, only the ones with continued problems. I also am seeing where some think the display also needs to be replaced. Possible?
Finally, you would not have a diagram on where in the refrigerator the control board is do you? Is it down in back with the coils or up front near the display board. Or elsewhere. Thank you. Your link to Repair Clinic is where I go to get my parts. Let me know your thoughts on whether there are other options for the problems like a stuck defrost cycle or something and what may cause it. Thank you. Steve