As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERSION/DECLARED EMERGENCY. AFT CARGO FIRE WARNING LIGHT ILLUMINATED AND BELL SOUNDED AT ALTITUDE. DISCHARGED SUPPRESSION SYSTEM. ON ARRIVAL NO VISUAL INDICATION OF FIRE. REMOVED AND REPLACED AFT A2 DETECTOR, CARGO DETECTOR ELECTRONIC UNIT AND FIRE BOTTLE PER MM.