Firdgeadare FRS26H5ASB5 not cooling on fridge side

Refrigerator & Freezer Repair
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1

I have a fridge that is not cooling.
If I turn the temp control all the way to the 0 position then turn it back on I get cold air out of the damper but after a while it closes and the temp climbs to around 50 or so.
Any ideas.