What was found
NUMBER 1 ENG OVERHEAT. DEBRIEF FLIGHT CREW, NO OVERWEIGHT LANDING. DURING CLIMB 3500-4000FT ENG 1 OVERHEAT ILLUMINATED. REDUCED N1 BELOW 50% OVERHEAT LIGHT EXTINGUISHED. PERFORMED CLIMB AGAIN & AT HIGH POWER LEVELS OVERHEAT WOULD ILLUMINATE. GVI OF COWLING HAD EVICENCE OF SOOT BTWN FAN & CORE COWL OTBD SIDE. CREW REPORTED REDUCED THRUST DURING CLIMB OUT TO EXTINGUISH LIGHT IAW NON-NORMALS PROCEDURE. OVERHEAT LIGHT ILLUMINATED AGAIN WHEN THRUST ADVANCED OVER 60% N1. REDUCED THROTTLE TO IDLE POWER FOR RETURN TO IAH. INSPECT ENG FOR PNEUMATIC LEAKAGE IAW FIM 26-10 TASK 811 FAULT ISOLATION PROCEDURE. PERFORMED BITE TEST IAW FIM 26-10 TASK 811, PASSED. TEST IAW 26-10 TASK 801, PASSED. PERFORMED ENG BLEED AIR LEAK CHK IAW AMM 36-11-00-700-802, FOUND PRSOV LEAKING AIR PERFROMED ENG BLEED AIR LEAK CHKD IAW AMM 36-11-00-700-802, FOUND DUCT PRECOOLER DUCT ASSY CRACKED, REMOVED CRACKED COWL ANTI ICE DUCT IAW PBM 71-00-02 FIG 13-1. REPLACED 12 O`CLOCK STRUT COWL ANTI ICE DUCT & REINSTALLED 12 OCLOCK STRUT IAW P/P BUILD UP MANUAL 71-00-02.