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Since the freezer still works, this means that you either have a defrost problem or the fan inside the freezer behind the back panel isn't running and needs to be replaced. Pull everything out of the freezer and remove the back panel. If the fan isn't running then replace it. If there is a lot of frost build up, then use a hair dryer to thaw it all out. You will then need to test continuity through the defrost heater and defrost thermostat. The defrost heater runs along the bottom of the silver coils and the defrost thermostat is the 1" round device clipped onto the top of the silver coils. If either part doesn't have continuity, you need to replace it or it stops the unit from thawing on it's own. If for some reason BOTH parts do have continuity, then your display board at the top of the refrigerator needs to be replaced because this is what controls the defrost cycle.To remove the back panel itself, just remove all the screws going into the back panel to start. There is a plastic vent directly in the middle toward the top of the back panel that you must unclip. There are 3 hidden clips you must pry on with a flat head screwdriver to release this vent panel and below is a picture where I drew an arrow to all the clip locations you need to pry on.
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