As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT DIVERTED DUE TO FMC LT OUTPUT LOSS. THE FLIGHT DECLARED AN EMERGENCY AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED FIM 34-61-00-815-820. REPLACED THE LEFT FMC IAW AMM 34-61-01. OPS CHECKED OK. THE AIRCRAFT WAS GROUNDED.