As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START, RECEIVED AFT CARGO WARNING MESSAGE. DISCHARGED AFT FIRE BOTTLES. WARNING WENT AWAY AFTER 2 - 3 MINUTES. *S/D* INITIAL CAUSE WAS THOUGHT TO BE INADVERTENT DETECTION DUE TO FUMIGATION OR MOISTURE BECAUSE OF NO SYSTEM FAULTS PRESENT. WHEN SAME EVENT OCCURRED 7 DAYS LATER IN FRA, THE AFT CARGO SMOKE DETECTOR (P/N:2119835-6 / S/N:34-A0035) WAS REPLACED AND SENT TO VENDOR FOR TEARDOWN. NO FURTHER EVENTS HAVE OCCURRED.