As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT FROM KTOL, THE CREW NOTICED NUMBER 4 FIRE WARNING LIGHT WAS INTERMITTENT. THE CREW RETURNED TO KTOL WITHOUT INCIDENT. MAINTENANCE INSPECTED NUMBER FOUR FIRE WARNING SYSTEM AND REPLACED LEFT AFT FIRE LOOP, OPERATIONAL CHECK WAS GOOD IAW DC8 MAINTENANCE MANUAL 26-10-1. AIRCRAFT WAS RETURNED TO SERVICE.