As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON ENGINE START CREW OBSERVED LT BLEED LEAK EICAS MESSAGE. MAINTENANCE FOUND RUPTURED DUCT IN SECTION 48 FORWARD OF APU ISOLATION VALVE. THERE WAS EVIDENCE OF WEAR ON DUCT FROM HEAT SHIELD CLAMP AT RUPTURED AREA. DUCT REPLACED, SYSTEM CHECKED SERVICEABLE.