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You are correct that there isn't anything else in the circuit so if the refrigerator is shutting off regularly like it thinks it's reaching the correct temperature, replace the sensor. If the unit is constantly running, then that sensor isn't going to cause your problem. The first thing you'll need to do is pull everything out of the freezer and remove the back panel inside the freezer. Look at the silver evaporator coils behind this panel and are they packed with frost, lightly frosted from top to bottom, some frost on top but not on bottom, no frost at all, etc... ?
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open and unrated. Is there anything else I can help you with?