First, unplug the heating if you haven't already. Second, I would remove all the bins to take a look at the heating. I am assuming you are using heat tape without a thermostat as well. You need a thermostat to operate the heat tape safely. But look to see if the heat tape is joined together or what else might cause the bottom to not heat as well as the top. Look just for any irregularities that could cause an issue down there. Pictures always help too!
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