As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 MCDU BLANK. CYCLED ACFT POWER TO REBOOT COMPUTERS NR 1 CDU OPS CHECKS NORMAL. NR 1 MCDU THEN LOCKED UP. ON NR 1 FMC CHECKED INFLIGHT FAULTS. FLT 9 HAD CDU FAULT. OPS CHECK OF NR 1 FMC AND NR 1 FMC CDU REF MM 34 61 00 710 801 AND 34 61 00 400 802. OPS NORMAL. PRECAUTIONARY REMOVED AND REPLACED NR 1 FMC CDU REF MM 34 61 01 000 802 AND 400 802. OPS NORMAL.