Whirpool Light On In Freezer Not On In Fridge

I have a Whirpool side by side that is four years old. I have no lights on the refrigerator side and also the digital readouts in the top of the refrigerator that tell you what the temp setting is in the refrigerator and freezer don’t work. The lights do work in the freezer and I also checked the bulbs in the refrigerator. Could this be the control board and if so which one? There is a control board in the refrigerator and one down where the compressor is. Any help in determining the exact problem would be appreciated