As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3546 - STL - DURING CRUISE, THE CREW RECEIVED A BAGGAGE BAY SMOKE INDICATION. THE BAGGAGE BAY FIRE EXTINGUISHERS WERE USED AND THE AIRCRAFT DIVERTED TO AN ALTERNATE AIRPORT DECLARING EMERGENCY. UPON INSPECTION MAINTENANCE DID NOT FIND A CAUSE FOR THE SMOKE INDICATION. THE AIRCRAFT WAS FERRIED TO THE MAIN MAINTENANCE BASE LOCATION WHERE THE BAGGAGE BAY AFT SMOKE DETECTOR WAS REMOVED AND REPLACED AND THE FIRE EXTINGUISHING BOTTLES WERE REMOVED AND REPLACED. FOLLOW-ON OPS CHECK OF THE INDICATION SYSTEM REVEALED NO ADDITIONAL FAULTS.