What was found
DTW - FLT 1885 - DURING TAKEOFF DTW EN ROUTE DFW, A LOUD BANG WAS REPORTED BY THE AFT FLT ATTENDANT. THR NR 2 EPR GAUGE WENT TO 1.6 EPR AND THE LOWER AFT BODY LIGHT ILLUMINATED. THE LOWER AFT BODY EMERGENCY CHECKLIST WAS ACCOMPLISHED. THE LIGHT EXTINGUISHED WHEN THE ENGINE WING AND NR 2 ANTI-ICE WAS COMMANDED OFF. RETURNED AND LANDED DTW WITHOUT INCIDENT. REPLACED RIGHT WING ANTI-ICE DUCTING AND HARDWARE FOR NR 3 ENGINE. ACCOMPLISHED LEAK CHECK AND OPERATIONS CHECK OF AIR CONDITIONING, PNEUMATICS, WING ANTI-ICE AND EPR SYSTEMS. SAFETY WIRED FUEL DUMP PANEL. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)