As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3617 DURING TAKEOFF THE CREW RECEIVED PACK 2 VALVE CLOSED AND BLEED 2 VALVE CLOSED MESSAGE ON EICAS. THE CREW NOTICED THE CABIN ALTITUDE WAS CLIMBING INTO AMBER. THE CREW DECLARED AN EMERGENCY AND RETURNED TO MIA LANDING WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED BLOWN SLEEVE AT NR 2 ENVIRO UNIT IAW AMM 21-51-00. THE AIRCRAFT WAS RETURNED TO SERVICE.