Hi Jfrey04,
I did not replace it but suppose it is easy, if you can get the spare part. When I built in a more silent fan for the fridge i discovered the sensor cable coming from the fridge to the controller. I have a 540D, so I am not sure if your 600 has the fridge at the same position. My fridge is below the stove. Under the stove there are two black plastic cover for the heat release of the compressor. If you take the inner cover you see the fridge controller and the little cable coming from the back of the fridge. It is sealed at fridge wall with some elastic material.
Some more details you can find in this very good blog
here
.
Good luck!
Axel
Axel, Columbus 540D AD, 150PS Bj 2018, Markise, 100W Solar, 176AH LiFePo, 16" Alufelgen, Nokian AT, SMV Luftfederung hinten, verstärkte Federn vorn, BioToi Trockentrenntoilette, ATOTO S8 mit Rückfahrkamera