As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT, MASTER CAUTION & FIRE LIGHT ILLUMINATED ON LT ENG. THERE WERE NO OTHER FIRE INDICATIONS. ENG WAS BROUGHT TO IDLE & SHUTDOWN USING ENG SHUTDOWN CHECKLIST. A CRACKED HIGH PRESS BLEED AIR LINE WAS DISCOVERED ON THE LT ENG. THE CRACK WAS ON THE JUNCTION FROM THE MOD VLV TO THE NAC HEAT WELD & EXTENDED APPROX 3/4 OF AN INCH PAST THE WELD. REPLACED THE LINE WITH A SERVICEABLE UNIT. OPERATIONAL GND RUN & CHECK FLIGHT TESTS PASSED. ACFT WAS RETURNED TO SERVICE.