The one that comes on when you close the refrigerator door.
Yes, that fan is operating
The buttons will change the temperature to "Set Temperature", but then nothing happens, It stays at the same internal temperature described above. I have the temp in the refrigerator set to 37, but the display shows the internal temp is 47
There is frost all along the back wall of the freezer.
OK, I did what you asked. The meter shows 0 ohms on both prongs.