As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE, THE CARGO SMOKE DETECTION CAME ON. EMERGENCY WAS DECLARED. EMERGENCY DESCENT WAS TAKEN AND BOTH FIRE BOTTLES WERE DISCHARGED. LANDED WITHOUT FURTHER INCIDENT. REMOVED AND REPLACED BOTH FIRE BOTTLES AND SQUIBS PLUS REPLACED BOTH SMOKE DETECTORS. OPERATIONAL CHECKED GOOD, THE AIRCRAFT WAS RETURNED TO SERVICE.