As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI THE CREW RECEIVED A BAGGAGE COMPARTMENT SMOKE INDICATION. THE CREW DISCHARGED THE FIRE EXTINGUISHERS FOR THE BAGGAGE COMPARTMENT AND RETURNED TO THE GATE WITHOUT INCIDENT. THE SYSTEMS AND THE BAGGAGE COMPARTMENT WERE THEN DEFERRED. MAINTENANCE LATER REMOVED AND REPLACED THE SMOKE DETECTORS AND THE FIRE BOTTLES. THIS ACTION CLEARED THE MEL AND ALL SYSTEMS CHECKED GOOD.