As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L CDU FAILURE, L FMC FAILURE: DURING FLIGHT CREW REPORT THE L FMC FAILED. DISCUSSIONS WITH MOC AND DO. ALL PARTIES AGREED TO CONTINUE. CREW CALLED BACK 1 HOUR LATER AND STATED THE L CDU FAILED AND WENT BLANK. FIGHT DIVERTING TO ANC DUE TO ETOPS AND FUEL RESTRICTIONS.