As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 11 - EN ROUTE, CREW RECEIVED INDICATIONS THAT BOTH FMGEC'S HAD LOST DATA. CREW MANUALLY ENTERED WAYPOINTS AND ROUTE DATA WAS UPLINKED. SYSTEM PERFORMED NORMALLY THROUGHOUT THE REMAINDER OF THE FLIGHT. MAINTENANCE REPLACED BOTH FMGEC'S. (M)