As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT INTO IAD, THE CREW REPORTED RECEIVING A BAG BAY SMOKE MESSAGE ON THE EICAS WITH NO ASSOCIATED SMOKE OR SMELL IN THE CABIN. THE CAPTAIN USED BOTH BAGGAGE BAY FIRE EXTINGUISHERS. MAINTENANCE REMOVED AND REPLACED BOTH BAGGAGE BAY SMOKE DETECTORS AND THE REPLACED THE BAGGAGE BAY FIRE EXTINGUISHERS FOLLOWED BY AN OPERATIONAL CHECK OF BOTH. NO DEFECTS NOTED AND/OR SMOKE NOTICED DURING THE OPERATIONAL CHECKS.