Kitchenaid KFIV29PCMS 3 Door Fridge/Freezer

Freezer stopped working a few days ago but the fridge is cooling fine. Evap. fan seems to be running and I cleaned the coils as they were very dirty and full of dust but still it’s not freezing now.

Any suggestions on what to check next would be greatly appreciated. Thx.

Where you ever able to refrigerator diagnosed?