What was found
FLT 840 - NRT - DURING CRUISE, A LOUD BANG WAS HEARD FROM THE AFT CABIN IN CONJUNCTION WITH BODY OVERHEAT LIGHT ILLUMINATING AND LOSS OF EPR IND AT NR 2 ENG. PULLED THROTTLE TO IDLE PER CHECKLIST PROCEDURE AND LIGHT WENT OFF. DIVERTED TO NRT. MX FOUND THE RT WING ANTI-ICE AIR DUCT ATTACHMENT FLANGE FAILED, AT BS 1223. THE RT WING ANTI-ICE SYSTEM WAS PLACARDED PER MEL 30-02 AND ACCOMP DDP. ALSO, THE NR 2 ENG EPR SYS WAS PLACARDED PER MEL 77-01. MX REPLACED THE RT ANTI-ICE DUCT AND THE ANTI-ICE AIR VALVE. SYS CHECKED GOOD. MX FOUND A EPR LINE BROKEN. THE EPR LINE WAS REPLACED AND THE SYSTEM CHECKED GOOD. (M)