What was found
ON FLIGHT 3967 THE CREW REPORTED, RECEIVED NR 1 BLEED LEAK MESSAGE ON EICAS IN CLIMBOUT AT APPROX 5000". FOLLOWED AOM NR 1 CHECKLIST WITH NR 1 BLEED OFF MESSAGE REMAINED AFTER 3 MINUTES. TURNED NR 2 BLEED OFF MESSAGE WENT OUT AFTER APPROXIMATELY 4 MINUTES WITH NR 1 BLEED BACK ON. THE CAPTAIN DECLARED AN EMERGENCY AND ELECTED TO RETURN TO ORD. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE T- TUBE LOCATED BETWEEN JOINTS 17 AND 19 ON NR 1 BLEED SYSTEM IAW M/M 36-11-09. THE LEAK CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.