As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT CAPTAIN AND FIRST OFFICER FMCS BEGAN DEGRADING UP. NUMEROUS FLAGS APPEARRED. CAPTAINS AIR SPEED WENT TO 0 MOMENTARILY. EICAS SHOWED LEFT FMC FAIL. EMERGENCY DECLARED. LANDING UNEVENTFUL. THE AIRCRAFT WAS GROUNDED. ACCOMPLISHED BITE OF LEFT AND RIGHT FMCS AND ADC WITH NO FAULTS FOUND. REMOVED AND REPLACED BOTH LEFT AND RIGHT FMCS AMM 34-61-01 AND AMM 34-61-00 AND ADC IAW AMM 34-21-01.