As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CVG TO GSP - AFTER TAKEOFF, THE FLIGHT CREW RECEIVED A BLEED 2 OVER-TEMP MASTER WARNING. THE FLIGHT RETURNED TO FIELD AT CVG AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT, THE FAULT TO THE NR 2 FAN AIR VALVE. THE NR 2 FAN AIR VALVE WAS REPLACED AND THE NR 2 BLEED SYSTEM OPERATED NORMALLY.