Just replaced the control board. Still have the problem of everything in the freezer melting and then refreezing. Any suggestions?

If you keep the setting too high that can be a problem you want to keep them mid range. Usually C or 3 in most refrigerators.

Is frost building up in the freezer coils so much that the airflow is being blocked? If so, you may have a problem with the defrost heater. See if this repair manual helps: https://dl.dropboxusercontent.com/u/8010163/GE_Profile_Side_by_Side_refrig.pdf