GE GFE27GSDESS

My freezer temperature keeps fluctuating throughout the day. It will go from 3 degrees to 20. I am not having issues with my fresh food temperature. My refrigerator temperature has been consistent at 34 degrees ever since I replaced the temperature board. We also replaced the freezer evaporator fan motor because that was not working. We cleaned and vacuumed all the buildup behind the freezer and the temperature is still not holding steady. We do not have much food in the freezer section because the temperature keeps fluctuating. Any other idea what else I should look into and repair?

Thank you all in advance,
Mary

It would be recommended that the freezer door gasket be checked for any air leaks. If there is not an air leak, does the compressor run continuously with the exception of stopping for around 30 minutes every so often throughout the day?