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You will need to remove the rear wall and floor of the freezer as the defrost drain is clogged. Thaw out whatever ice is there and you will have the problem solved when water flows down the defrost drain hole. DO NOT chip at the ice as you will crack something. Use a spray bottle or hair dryer. You may need to blow thru the defrost drain to clear any non-ice blockage. This is nothing complicated- you basically have a clogged drain, so do and use whatever common sense would dictate to clear it. The drain is a small hole centered under the coil that you will see when the rear wall is removed.