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your leak is a common issue. the defrost drain is frozen. when you refrigerator goes into automatic defrost the water is supposed to go down a tube into a pan below the refrigerator. the tube is frozen. there are two ways of defrosting that. one is to remove the rear panel inside the freezer (behind your food) and pour boiling water over the ice until it defrosts and drains freely again. the second way is the way your doing it however this can take 24 hours with the refrigerator unplugged and the doors left open.