As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 1556 ORD TO YHZ DURING INITIAL APPROACH WHEN FLAPS 1 WAS SELECTED THE CREW RECEIVED A SLAT FAILURE CAUTION MESSAGE ON THE EICAS. THE CREW WAS ABLE TO EXTEND FLAPS TO 2, DECLARED AN EMERGENCY AND LANDED THE AIRCRAFT WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED RIGHT NR 5 SLAT ACTUATOR.