As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFT CARGO FIRE WARNING LIGHT TRIGGERED DISCHARGE OF AFT CARGO FIRE BOTTLES, FLIGHT DIVERTED TO BOS AND DECLARED EMERGENCY. UPON INSPECTION, NO EVIDENCE OF SMOKE OR FIRE PRESENT. REPLACED AFT CARGO SMOKE DETECTOR IAW AMM 26-16-01, OPS CHECK GOOD.