As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 823, EMERGENCY DECLARED. DIVERTED. RECIRCULATION SMOKE IN FLIGHT EICAS SMOKE DETECTION FAILED ON LANDING. INSPECTED AND FOUND NO EVIDENCE OF SMOKE IN CABIN, CARGO OR AVIONICS COMPARTMENT. ON LANDING EICAS MESSAGE WAS REMOVED AND REPLACED BY RECIRC SMOKE DETECTION FAIL MESSAGE. RECIRC SYSTEM SMOKE DETECTOR PLACED ON MEL . R & R SMK DET IWA 26-16 OPS CK OK MX4 UPDATED PLACARD REMOVED MEL CLEARED