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This ice/frost build up occurs due to the flap inside the dispenser not sealing up properly. Now either it's always just not closing all the way and sealing up properly, or it could be intermittently getting stuck.
The model number you have listed is actually a part number and the full model is located on a sticker near the ceiling of the refrigerator section. You'll need to to order the correct replacement part. You'll either need to replace the dispenser chute flap itself, or the closing mechanism if its sticking.
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No, that's in the back, not by the door seal in the front. If ice is building up back there, your drain froze over. You'll need to unplug the unit for 24 hours to allow the ceiling and drain to thaw out. Then you can plug it back in and it should be OK again.