What was found
(CAN) RT ENGINE PYLON OVERHEAT, RED EICAS MESSAGE. FOUND RT PYLON FIREWALL BOOT SEAL, IPC 78-31-15, ITEM NR 32, TO BE DETERIORATED, FLAKING, BRITTLE AND LEAKING HOT AIR FROM N1 FAN BYPASS DUCT INTO PYLON, ONTO PYLON OVERHEAT DUCT SENSOR. FAN BYPASS DUCT AIR PASSES OVER HP BLEED, ENGINE SIDE, AIR LINES AND HEATS UP AIR. IF PYLON FIREWALL SEAL IS DETERIORATED THE HEATED FAN BYPASS AIR WILL LEAK BY INTO THE PYLON AND TRIGGER EICAS MSG AT 250 DEGREES F.