As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NUMBER 8026, DURING CRUISE CAPTAINS CDU LOCKED UP THEN WENT BLANK FOR APPROXIMATELY 15 MINUTES AND THEN CAME BACK ON LINE ON ITS OWN ACCORD AND OPERATED NORMALLY FOR REMAINDER OF FLIGHT. MAINTENANCE TESTED THE CAPTAINS CDU, ALL TEST NORMAL. THE CAPTAINS AND FIRST OFFICERS CDU'S WERE SWAPPED FOR TROUBLESHOOTING. R&R OF CDU'S IN ACCORDANCE WITH 34-60-101.