What was found
LEFT ENGINE WITH OIL LEAK, DURING TRANSIT CHECK, IT WAS A DETECTED AN OIL LEAK ON LEFT ENGINE. MAINTENANCE PERSONNEL PERFORMED A REVISION AT LEFT ENGINE,NO CONFIRMING OIL LEAK; AS A PRECAUTIONARY ACTION AT MEX, AN ENGINE OIL SYSTEM EXTERNAL, FAN COWL AND THRUST REVERSER OPEN INSPECTIONS WERE PERFORMED, DETECTING LEAK ON STARTER GENERATOR; SO IT WAS REPLACED IAW AMM 80-11-11 AND LEFT ENGINE WAS RUNNING AT 70% OF N1 IAW AMM 71-00-00-710-801-G00, TESTED CORRECT.