As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH CAPTAIN`S AND FIRST OFFICER'S FMC/CDU SCREENS WENT BLANK AND AUTOPILOT REVERTED TO CWS ROLL. SCREENS REAPPEARED AFTER A COUPLE OF MINUTES. ACFT GROUNDED. PERFORMED FMC BITE IAW FIM 34-61 TASK 801. IN-FLIGHT FAULTS SHOWS NO FAULTS. PERFORMED FIM 34-61 TASK 804. FMC CDC AND FMC OPS NORMAL. OK FOR SERVICE.