As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3052 - SAV-LGA - WHILE AT FL370, THE BAGGAGE FIRE EXTINGUISHER BUTTON LIT UP, NO EICAS OR AWU WARNING/MESSAGES DISPLAYED. UPON PRESSING THE BAGGAGE FIRE EXTINGUISHER BUTTON, THE BAGG SMOKE EICAS MESSAGE APPEARED BRIEFLY THEN DISAPPEARED 15-20 SECONDS LATER. FIRE BOTTLE INOP MESSAGE APPEARED, NO AWU WARNINGS AT ANY POINT. DECLARED AN EMERGENCY AND COMPLIED WITH QRH. LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE HIGH RATE BOTTLE AND METERING BOTTLE IAW MM 26-23-01.