What was found
TPA - FLT 1553 - AFTER TAKEOFF TPA DURING CLIMB-OUT, NR 1 ENGINE STRUT OVERHEAT LIGHT ILLUMINATED. ACCOMPLISHED ABNORMAL PROCEDURE AND LIGHT EXTINGUISHED WHEN NR 1 BLEED CLOSED. AIRCRAFT RETURNED TO TPA AND LANDED WITHOUT INCIDENT. PLACARDED NR 1 BLEED AND AIRCRAFT RE-DEPARTED. PROBLEM REPEATED DURING CLIMB-OUT AND AIRCRAFT RETURNED TO TPA. REPLACED NR 1 ENGINE AIR CONDITIONING HEAT EXCHANGER MANIFOLD DUCT. ACCOMPLISHED GROUND ENGINE RUN WITH NO DEFECTS NOTED. SYSTEM LEAK AND GROUND CHECKED, NORMAL OPERATION. REMOVED PLACARD TO NR 1 ENGINE BLEED. (X)