As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/O FMC/CDU WENT BLANK FOR 10 SECS THEN CAME BACK ON. ONCE IN FLIGHT ONCE ON GND. OPS NORMAL WHEN IT CAME BACK ON. F/O FMC FFR SHOWS 1 MCDU FAULT. REMOVED & LIFTED F/O CDU KEYBOARD & INSPECTED FOR SECURITY NO FAULT FOUND. RE-INSTALLED F/O CDU KEYBOARD. ACCOMPLISHED FMC TESTS REF AMM34 61 00, OPS CHECK NML.