As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT AIR DATA COMPUTER FAULED IN FLIGHT AT FL390. UNRELIABLE AIRSPEED, UNRELIABLE ATLTITUDE, AILERON LOCKOUT AND RUDDER RATIO CALL INDICATION ON EICAS PILOT DECLARED AN EMERGANCY AND LANDED . MAINTENANCE GROUNDED AC. TROUBLE SHOT AND REPLACED LH ADC IAW 34-12-01 OPS CHECK GOOD AC REMAINS NON RVSM PENDING HIGH RANGE LEAK CHECK . AND RETURNED AC TO SERVICE.