Hi I'm John I will help you with the problem.
Open the freezer door and reach in to the back panel can you see frost on the panel and can you hear the freezer fan motor going ?
If the fan motor isn't going thats the problem no fan the fridge side cant get cold .
Replace the fan motor it should fix the problem.
The fridge is in the defrost cycle look in the same control box where the thermostat is located you should see a defrost control
I will look at the model number again It may take a few minutes.
This is the control board check this part for a burn mark ,
this controls the whole fridge.
Great that was easy.
Thanks and God bless.