As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CARGO SMOKE LIGHT AFTER TAKEOFF. THE CARGO COMPARTMENT BOTTLE WAS DISCHARGED AND THE AIRCRAFT RETURNED TO THE FIELD. AIRCRAFT WAS INSPECTED, NO SMOKE OBSERVED, THE SYSTEM DEFERRED AND THE AIRCRAFT RETURNED TO SERVICE. THE SMOKE DETECTOR, FIRE BOTTLE AND SQUIB WERE REPLACED WITH ALL INDICATIONS NORMAL.