What was found
APPROXIMATELY 2 TO 2 1/2 MINUTES AFTER TAKEOFF, NOTICED THE LEFT TORQUE GAUGE GOES TO APPROX 10 PERCENT OR LESS, FOLLOWED BY THE LEFT NO FUEL TRANSFER LIGHT ILLUMINATING, FOLLOWED BY THE AIRCRAFT YAWING TO THE LEFT AND THEN THE OTHER ENGINE GAUGES REFLECTING THE LEFT ENGINE FAILED. NO FIRE LIGHT WAS ILLUMINATED. UNEVENTFUL SINGLE ENGINE LANDING ACCOMPLISHED. REPLACED THE LEFT ENGINE PY LINE GOING TO THE PROP GOVERNOR WITH SERVICEABLE ASSEMBLY P/N 3032125. GROUND RUN OPS CHECKED GOOD.