As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DETECTOR CHANNEL 1 AFT CARGO COMPARTMENT SMOKE DETECTOR FAILURE. FAN 1 OF THE LOWER AFT DETECTOR HAS FAILED ONLY. MEL CARD CHANGED TO REFLECT THIS CONDITION. REPLACED NR 1 SMOKE DETECTOR FAN IN AFT CARGO PIT IAW MM 26-16-02 DO SYSTEM TEST ON MAT PASSED & MESSAGE ON EICAS IS GONE.