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Do u see any ice or frost build up inside the freezer rear panel? Also, can I get the model number as this fridge may have what's called a damper control.
This fridge gas a fan motor in the fresh food side as well there is a vent inside towards the back hold in the door switch for about 10 seconds to see if it blows air from the vents
By the light assembly or to the sides
Checking for damper
The damper sits behind that vent towards the back in the center of the fridge. That plastic cover comes off then you will see a vent it should be opened. If that vent is closed you have a bad damper assembly and it will need to be replaced.
There should be a plastic square door. Open it towards you a little.
The only thing that it can be based on the freezer being okay is the refrigerator fan motor going out.
Leaving the door open would have allowed the air ducts to freeze up. Open the doors and unplug the refrigerator for 24 hours to thaw and it should start cooling fine once plugged back in.