As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FINAL APPROACH LOW CARGO COMPT FIRE LIGHT CAME ON AS SOON AS PACKS WERE TURNED OFF IT WENT AWAY. PERFORMED LOWER CARGO COMPT SMOKE DETECTION SYS T/S MM 26-18-00-1. REMOVED AND REPLACED BATTERIES ON DETECTORS FA1326, AC3305, AD6652, AD7666 SYS OK LIGHT INDICATED.