As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING BOTH CDU'S WENT MOMENTARILY BLANK (APPROX 2 SEC) THEN RETURNED TO NORMAL. GROUNDED - YES. NO HISTORY OF SAME 60 DAYS. LT & RT FMC FFR SHOWS A LOGGED GND FAULT OF LT FMC. CURRENT OPS CHECK OF BOTH FMC'S GOOD. REF AMM 34-61-00.