As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3605 DURING CRUISE THE CREW REPORTED, RECEIVED AN ATTITUDE HEADING REFERENCE SYSTEM FAIL EICAS MESSAGE. THE CAPTAIN DECLARED AN EMERGENCY AND DIVERTED TO SAV. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED NR 2 ATTITUDE HEADING REFERENCE SYSTEM IAW EMB AMM 34-21-01. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.