As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DEPARTED AND 10 MINUTES INTO FLIGHT HAD A ZONE 1 FIRE WARNING ON NR 2 ENGINE. FIRE BOTTLES DISCHARGED, ENGINE FEATHERED AND AIRCRAFT RETURNED TO DEPARTURE AIRPORT. SUSPECTED FAULTY FIRE WARNING PANEL AND 3 DETECTORS REPLACED AFTER THOROUGH INSPECTION OF ENGINE AND OEC WHICH SHOWS NO EVIDENCE OF ACTUAL FIRE.