As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT AT 500 FT, CREW RECEIVED AN EICAS MESSAGE FOR FWD CARGO SMOKE. CARGO FIRE BOTTLE WAS ARMED THEN FIRED. CREW INITIATED AIR TURN BACK TO DEPARTURE, AND LANDED UNEVENTFULLY. R & R ALL FWD CARGO SMOKE DETECTORS PER AMM 26-15-01. ALL OPS TEST NORMAL.