What was found
DFW - FLT 0554 - AFTER TAKEOFF DFW DURING INITIAL CLIMB-OUT, LOUD VIBRATION OCCURRED ACCOMPANIED BY HIGH EGT AND DECREASING RPM IN NR 2 ENGINE. ACCOMPLISHED SHUT DOWN OF NR 2 ENGINE. BOTH FIRE BOTTLES WERE DISCHARGED FOR NR 2 ENGINE, HOWEVER, THE DISCHARGE LIGHTS DID NOT ILLUMINATE. AIRCRAFT DUMPED FUEL AND RETURNED TO DFW, LANDING WITHOUT INCIDENT. RE-SECURED LOOSE WIRE ON NR 2 FIRE EXTINGUISHER DISCHARGE SWITCH. ACCOMPLISHED SQUIB TEST WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED, NORMAL OPERATION. ALSO, REPLACED NR 2 ENGINE DUE TO TURBINE FAILURE. (X)