Welcome to JustAnswer. I'm John. Lay a fold of paper towels on the floor, underneath the fridge. If the towels get wet, inspect the ice maker water filter for a leak. If there's no filter, inspect the defrost water drip pan at the bottom of the fridge for overflowing water there.
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If you refer to the metal lines in the sealed system, one of them usually has a thin layer of ice on it.