You guys are right!
Somehow there is a break in the white neutral, between the terminal board by the line cord, and the first point I can test inside the freezer back (only about 2 ft away). I wondered about the design when I saw only one 18 gauge white neutral for the entire upper frig and freezer. This includes the heaters, ice maker, ice auger motor, etc.. Doesn't seem like a good design choice.
Does the silicone rubber connector come loose from inside the back of the freezer , so those wire connections can be removed?
If not, I agree that the easiest or only solution is to string a new wire along a different path.
I can't see the grommet where the refrigerant tubes go through, so if you can point me where to look, I'll check it out. I can easily see the freezer drain, and stringing a wire there is certainly straight forward. However, I also wonder about just drilling a hole through the metal back into the freezer compartment, then sealing a wire in with silicone. Obviously a spot needs to be chosen that doesn't interfere with any wiring. What are the thoughts on these choices?