What was found
WHILE PERFORMING OTHER NON-RELATED MAINTENANCE, THE LT ENGINE TRUSS WAS DISCOVERED TO BE COMPLETELY CRACKED THRU (360 DEGREES) ON THE LOWER LT TUBE JUST ABOVE THE ATTACH BRACKET FOR THE LOWER ENGINE AIR CAN ASSY, ADJACENT TO THE P3 BLEED LINE. NO OBVIOUS CHAFFING DAMAGE WAS NOTED, AND APPEARS TO HAVE BEEN CORRODED FROM INSIDE. ALSO, A SMALL HOLE WAS NOTED ON SAME TUBE AT TUBE WELD JUNCTION AT MAIN ATTACH POINT. TRUSS REMOVED FOR FURTHER EVALUATION BY MANUFACTURER. NEW TRUSS INSTALLED, AIRCRAFT RETURNED TO SERVICE.