As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#32, AMS-BOS. (ETOPS) 'PRIOR TO SECOND -TO-LAST OCEANIC WAYPOINT, FMS SHOWED ERRONOUS MILEAGE TO DESTINATION. ALL WAYPOINTS CHECKED, NAV SOLUTION ACCURATE THEN TIME TO GO EFOB WOULDN'T DISPLAY. POSITION WAS ACCURATE SO AFTER CONFIRMING WITH MX, CONTROL CONTINUE READING. DURING THIS TIME ADS-C WAS CONNECTED BUT HAS TO MANUAL POSITION REPORT. APPROX 2 HOURS LATER. FMS INFO SEEMED NORMAL AGAIN; REMOVED AND REPLACED FMGC IAW AMM 22-84-34. OPS CHECKED GOOD.'