As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI IN NR 2 MAIN DECK CARGO SMOKE DETECTOR ILLUMINATED. REPLACED NR 2B AND NR 3A MAIN CARGO SMOKE DETECTORS PER B747 MM 26-14-01 OP'S CHECK GOOD PER B747 MM 26-11-00. INFORMATION ON SECOND UNIT CHANGED WITH THE UNIT BELOW P/N FR2121 S/N 331.