What was found
ON FLIGHT 4088 THE CREW REPORTED THAT AT TAKEOFF AT 500 AGL, RECEIVED A BLEED 2 LEAK INDICATION ON EICAS. PERFORMED EPC CHECKLIST AND THE CAPTAIN DECLARED AN EMERGENCY. THE BLEED LEAK MESSAGE EXITING WHEN DESELECTED BLEED 2 VALVE. RETURNED TO ORD AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE SLEEVE ON THE DUEL TEMPERATURE CONTROL VALVE IAW EMB 145 AMM 21-60-01. THE AIRCRAFT WAS RETURNED TO SERVICE.