What was found
FLT 192 - MTY-TIJ - AIRCRAFT RETURNED TO PLATFORM, DURING LEFT ENGINE STARTER, N2 TURN 6 PERCENT N1 TURN 1 PERCENT ONLY AND WITH STRONG NOISE LOW LEFT ACCELERATOR. DURING OPEN COWLING WAS DETECTED ENGINE AIR TURBINE WITH LEAK. THE ENGINE AIR TURBINE WAS REPLACED IAW MM 80-1-01, ENGINES WERE STARTED, ALL TESTS CORRECT. (M)