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So it sounds like you have a defrost issue which prevents the air from circulating properly and cooling like it should. You'll need to pull everything out of the freezer and remove the lower back panel inside the freezer. This will expose all the frost building up on the evaporator cooling system. Next, unplug the refrigerator. There is a defrost heater that runs along the bottom of the silver coils and a 1" round device clipped onto the top of the frosted evaporator coils with 2 wires going to it. You'd need a multimeter to test continuity through both parts. If either part doesn't have continuity---replace it. If both parts have continuity through them, the main control board would need to be replaced because it's not controlling the defrost cycle properly.
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There is below the refrigerator, but you should probably put a towel below the frosted coils when you thaw them out to prevent the pan from overflowing. The pan is not really removable.
You can do whatever you'd like but I gave you every scenario in the beginning so regardless of what you find you should know what to do at this point.
alright good luck to you.