Solution Found
So I was to the point of replacing the temp sensor and control for this fridge. I took the control plate off and began to remove the part with the dial. The face plate was covering up another screw and the word "Colder" along with an arrow stamped into the control unit. The arrow is pointing counter clockwise. I turned this new screw counter clockwise two rotations and then plugged the fridge back in, with the "Main" control knob still set all the way to the right [clockwise]. The fridge temp got down to 20 deg F. So I adjusted the hidden screw about a half turn clockwise [warmer] and measured again. 37 deg F average temp. The unit comes on at about 41 and turns off at 34. Problem solved.
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