As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NUMBER 273, DURING CRUISE FIRST OFFICERS CDU WENT BLANK. SELECTING ALTERNATE FMC DID NOT CORRECT FAULT. MAINTENANCE REMOVED AND REPLACED THE FLIGHT MANAGEMENT COMPUTER CONTROL DISPLAY UNIT PER MM 34-61-02. OPERATIONAL CHECKS GOOD.