What was found
MULTICONDUCTOR CABLE AT AREA WHERE ROUTED THROUGH PYLON, HAS BRAIDED JACKET, INSULATION OVER WIRES, AND RUBBER PAD ON CABLE CLAMP IS EATEN AWAY BY SURFACE VIBRATION OR FOREIGN OBJECT DAMAGE FROM SUBSTANCES IN AIR BLOWING OVER CABLE. NR 2 AND 3 PYLONS ARE AFFECTED. THIS IS THE THIRD AIRCRAFT IN SEQUENCE WHERE THE PROBLEM HAS BEEN OBSERVED. CABLES ARE PART OF ENGINE FUEL AND CONTROL SYSTEM. LOCATION OF DAMAGED AREAS VARIES SLIGHTLY BETWEEN AIRCRAFT. REPAIRED CABLE AT HEAVY MAINTENANCE CHECK.