What was found
AFTER TAKEOFF AT 500 FT, FELT A LOUD "THUMP" LIKE A BIRDSTRIKE. THIS WAS FOLLOWED BY AN INDICATION OF NR 3 BLEED CLOSED (VALVE WAS SELECTED OPEN). THIS WAS FOLLOWED BY A "REV 3 PRESS FAULT". T/R WAS 'NOT' UNLOCKED. ALL OTHER ENGINE INDICATIONS WERE NORMAL. THRUST REVERSER OPERATED NORMALLY ON LANDING. REV 3 PRESS FAULT REMAINED AFTER T/R WAS STOWED. WHILE PARKING ACFT, NOTICED BLOWOUT DOOR ON THE BOTTOM OF THE NR 3 ENGINE OPEN. FOUND BAND CLAMP FAILED BETWEEN PRESSURE REGULATOR VALVE AND HSV. NR 3 LT THRUST REVERSER DAMAGED BY PRESSURE REGULATOR VALVE. NEEDS THRUST REVERSER, HSV, PRV, DUCTS AND SENSE LINES. REMOVED AND REPLACED NR 3 ENG. HP BLEED CONTROL VALVE PER MM 36-11-02-4, AND REG PNEU PRESS VALVE PER MM 36-12-01-4.BOTH VALVE NEEDS OPS CHECK AND RTS CHECK. REMOVED AND REPLACED PWR PLANT BLEED DUCT,WING PYLON PNEU DUCT ,AND ACF COR WIRE HARNESS.DUCTS NEEDS LEAK CHECK.