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Inside the freezer, up high just below the icemaker and behind the plastic part with the slits , sits the evaporator fan motor, ( see it at www.repairclinic.com part number WR60X10185 ) This is most likely where the noise is originating.. Not the simplest to get to - remove the ice maker and the auger motor assembly and go from there
If you have food in it and it is otherwise working OK - yeah leave it plugged in.
Jim , did you ever get to looking at the fridge ?