What was found
SHORTLY AFTER TAKEOFF, THE PILOT OBSERVED THE LT ENG, DUCT LEAK ANNUNCIATOR LIGHT ILLUMINATED & AURAL WARNING SOUNDED. THE PILOT FOLLOWED PROCEDURES IN QRH & PERFORMED PRECAUTIONARY IN FLIGHT SHUT DOWN OF THE LT ENG. PILOT DECIDED TO RETURN & LANDED WITHOUT FURTHER INCIDENT. TROUBLESHOOTING FOUND BROKEN WIRE ON LT SIDE FRAME 24 SENSOR & WAS RUBBING ON THE SENSOR. REPAIRED WIRING AT LT SIDE FRAME 24 SENSOR & LT SIDE FRAME 25 SENSOR. PERFORMED GND RUN OF THE LT ENG. ALL ENG INDICATIONS WERE NORMAL.