What was found
AC DEPARTED, ENROUTE, THE CREW REPORTED THAT ABOUT 2 HOURS AND 15 MIN INTO FLIGHT AT FL370, THE BAGGAGE FIRE WARNING LIGHT ILLUMINATED WITH AN AURAL WARNING. AFTER 3 SECONDS THE LIGHT WENT OUT AND THE HORN HAD BEEN SILENCED. ONE MINUTE LATER THE SCENARIO REOCCURRED AND THE WARNING LIGHT REMAINED ILLUMINATED. CREW COMPLETED THE EMERGENCY BAGGAGE COMPARTMENT FIRE CHECK LIST, BLEW FIRE BOTTLE, AND DECLARED AN EMERGENCY AND DIVERTED . LANDED 10 MINUTES AFTER INITIAL OCCURRENCE, UNEVENTFUL. AFTER SHUTDOWN ON TAXIWAY, FIRE CREW THERMAL IMAGED THE BAGGAGE COMPARTMENT WITH NEGATIVE RESULTS. UPON OPENING COMPARTMENT NO EVIDENCE OF SMOKE OR FIRE WAS FOUND, THE COMPARTMENT WAS COOL. TROUBLESHOOTING REVEALED BAGGAG