As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - DIVERTED FLIGHT (1/14/01) - AFTER TAKEOFF FROM LAS, THE FLIGHT CREW EXPERIENCED A DUAL MCDU FAILURE; THEY WERE FROZEN ON RESPECTIVE PAGE AT THE TIME OF FAILURE AND WERE UNABLE TO INPUT DATA. CIRCUIT BREAKER B-1 & N20 WERE RESET WITH NO HELP. CREW SWITCHED TO STANDBY NAV SYSTEM AND DIVERTED TO PHX. IN PHX THE PROBLEM WAS ISOLATED TO THE NR 1 FMGC WHICH WAS REPLACED AND FUNCTIONALLY CHECKED GOOD. CURRENT NAV DATA WAS LOADED PER AWA TASK CARD A1B34321.