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is there any frost on the back panel inside the freezer?
thats why! great job, it can only be one of three things 1 the defrost timer. 2 the defrost thermostat, clipped to the coils on top, or 3 the defrost heater itself, check the defrost thermostat for continuity when its cold if it has continuity its good same with the heater if it has continuity its good, if both of those do then replace the timer, heres a link to all the diagrams and parts, thanks Bryan