Thanks for the question.
Can you feel or see frost on the freezer panel and is the fan motor going in the freezer.
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The number 1891 is the panel in the freezer that you can remove to see if the freezer coils are frosted , if their not frosted tell me how much of the coil is cold.
Its your three so your ok for a few years, its not a job you can do it takes special tool and a license.
Thanks and God Bless.