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So you are 100% correct that if your defrost thermostat and heater check good that it leaves your defrost timer. On this unit the defrost timer is located underneath the freezer. You should be able to access it by pull the freezer forward and removing the lower back panel to look for the defrost timer down below. You will need to replace this part to resolve the issue. Below is a link to the part.
CLICK HERE for defrost timer
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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?