What was found
IN FLIGHT, TAILPIPE CLAMP FAILED ALLOWING HOT GASSES TO ENTER NACELLE REGION. PAINT ON HOT AIR SHIELD/DUCTING WAS BLISTERED. N-1 TACHOMETER BEGAN TO WORK INTERMITTENTLY, ITT IND WENT OUT, FIRE LIGHT CAME ON, HIGH-PRESSURE BLEED AIR DUCT OVERHEAT WARNING CAME ON. LANDING, ENG WAS EXAMINED, NO IND OF DAMAGE TO INTERIOR OF NACELLE. SS SHIELDS, WHICH FORM COOL AIR DUCT AROUND REAR OF ENGINE, FOUND TO HAVE BLISTERED AND BURNED AWAY PAINT. SHROUDS WERE CLOSELY EXAMINED, FOUND TO BE INTACT WITHOUT DEFORMATION OR RUPTURES. CLAMP WAS REPLACED, TEST RUNS SHOWED ALL INDICATIONS RETURNED TO NORMAL OPERATION, INDICATIONS DURING TEST RUNS THAT INCLUDED HIGH POWER. NO MFG REQUIREMENT TO REPLACE THIS PRIOR TO FAILURE.