freezer cold, refrig warm, coils NOT frosted

I had the control board repaired and then reinstalled 30 days ago. Previous problem (erratic lights and temp, buzzing noise from unit, etc…) Looks like a replay replaced. It seemed to work fine holding temp in freezer (2 Deg) and refrig (34Deg) until 2 days ago. Now the freezer is going between 2 and 8 then 2 degrees); refrig is now steady at 57 Deg. Compressor is running, or at least I hear the unit on top running. No frost on coils, coils feel warm. Freezer has cold air blowing in. Nothing seems to be happening with refrig. Looking for some help!!
Thanks,
Steve