What was found
DFW - FLT 1044 - AFTER TAKEOFF WHILE PASSING THROUGH 900 AGL, NR 3 ENGINE HAD BANG AND SEVERE VIBRATION. EPR N1 AND N2 DROPPED BUT ROTATION CONTINUED. ENGINE EGT WENT TO 610 AND ENGINE SHUTDOWN. RETURNED TO LAND TO DFW. WHILE ATTEMPTING TO DUMP FUEL, LEFT NOZZLE ON FUEL DUMP VALVE FAILED TO OPEN. LANDED DFW WITHOUT INCIDENT. REPLACED NR 3 ENGINE. SYSTEM GROUND CHECK NORMAL OPERATION. (M)