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The first thing you'll need to do is pull everything out of the freezer and remove the lower back panel inside the freezer. Look at the silver evaporator coils behind this panel and are the packed with frost, lightly frosted from top to bottom, some frost on top but not on bottom, not frost at all, etc... ? Also, is the fan above the coils running?
I understand the freezer side works find---what you don't understand is how this refrigerator works. We can debate why I'm asking you to make this check if you'd like, but I'm having you check this for a reason.