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The first thing you'd want to do is confirm whether or not the refrigerator is actually getting too warm or not. Next, you'd 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 they 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?