As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT AT 10,000FT ADDVISORY MESSAGE APPERED CRG AFT FIREX HI ARM RED AFT CARGO SMOKE TURNED ON. BOTH WENT AWAY NO CAUTION ALARM OR EICAS MESSAGE.-C/A-PERFORMED OPS CHECK OF CARGO SMOKE DETECTION SYSTEM IAW AMM 26-11-00.NO FAULTS NOTED.