As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON CLIMB OUT AT APPROXIMATELY FL280 ECAM MESSAGE, FROWARD CARGO SMOKE INDICATION. BOTH FIRE BOTTLES (P/N 472931-2 AND 472930-2) ACTIVATED. FLIGHT CREW CHECKED FORWARD CARGO HOLD FOR FIRE IN FLIGHT. NO EVIDENCE OF FIRE FOUND. MAINTENANCE ACTION INVOLVED CHANGING SMOKE DETECTOR CONTROL UNIT AND BOTH FIRE BOTTLES AND SYSTEM CHECKED.