As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NR 4 SMOKE DETECTOR LIGHT AND CARGO FIRE LIGHT ILLUMINATED WHILE ON APPROACH TO OSA. THE NR 1 CARGO FIRE EXTINGUISHER WAS DISCHARGED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND NO EVIDENCE OF FIRE. THE NR 4 SMOKE DETECTOR WAS REMOVED AND REPLACED. THE NR 2 SMOKE DETECTOR WAS ALSO REPLACED DUE TO ERRATIC TESTING. OPERATIONAL CHECKS WERE GOOD. THE NR 1 CARGO FIRE EXTINGUISHER WAS REMOVED AND REPLACED. PART TOTAL CYCLES, 7,352.