What was found
ORD/MXP - FLT AZ9163/02 - DURING CLIMB-OUT AT 4,000 FEET, NR 4 ENGINE NACELLE TEMPERATURES INDICATED 7.6 DEGREES ON BOTH 'A' AND 'B' LOOPS. TEMPERATURE DECREASED WHEN THROTTLE WAS RETARDED. CLOSED BLEED VALVE ACCORDING TO FHB PROCEDURE. AS NR 4 THROTTLE WAS ADVANCED, TEMPERATURE STARTED TO CLIMB. JETTISONED 40,000 KGS OF FUEL. RETURNED TO ORD, LANDING WAS UNEVENTFUL. MAINTENANCE INSPECTION OF NR 4 ENGINE REVEALED A FRACTURED 14TH STAGE BLEED MANIFOLD P/N 906M87G02. MANIFOLD REPLACED. ENGINE RUN-UP CHECKS NORMAL. (X)