As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS THE FLIGHT WAS DIVERTED ON ACCOUNT OF AN AFT CARGO FIRE WARNING INDICATION. FIRE BOTTLES DISCHARGED. EMERGENCY DECLARED. FLIGHT LANDED WITHOUT INCIDENT. RESPONDING FIRE CREW FOUND NO INDICATION OF FIRE. AIRCRAFT TAXIED TO GATE NORMALLY. MAINTENANCE REMOVED & REPLACED THE AFT CARGO SMOKE DETECTOR.