As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT FL 280 RECEIVED FIRE INDICATION ON AFT CARGO FIRE ARMED SWITCH. DID NOT GET AURAL OR MASTER WARNING. FOLLOWED QRH.AND DISCHARGED BOTTLE 1. FIRE INDICATION REMAINED ILLUMINATED FOR ABOUT 15MINS. REPLACED THE NR 1 CARGO FIRE EXTINGUISHER CONTAINER AND SQUIBS. ALSO REPLACED FIRE CONTROL PANEL. CARGO FIRE PROTECTION OPERATIONAL TESTS OK.