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So unfortunately you have a clogged defrost drain line that is what causes this issue. You will need to pull the refrigerator out and unplug the unit. Remove the lower back access panel behind the refrigerator and locate the drain hose coming down the back of the refrigerator directly in the middle. Remove the cover to access the j-loop p-trap where the drain hose is connected and remove the drain hose as well as the p-trap. Flush both of them out completely to clean them. Then re-assemble.
Now, the drain entry will also be frozen over so you can either unplug the refrigerator for 24 hours and let it thaw out on it's own, or else you need to remove everything inside the refrigerator including the crisper drawers and shelves. The floor inside the refrigerator pries out under the front lip of the divider and then you can remove the floor and the styrofoam below the floor. Now just heat up the ice below the fan in the back of the refrigerator below the floor you just removed until you can poor hot water down the drain hole and it drains down into the drain pan by the compressor and not into the freezer.
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