What was found
AIRCRAFT RETURNED TO PLATFORM AS A CONSEQUENCE OF DURING THE LEFT ENGINE STARTED, THE N2 REACHED 30 PERCENT AND IT DID NOT INCREASE. THE LEFT ENGINE WAS STARTED AGAIN OPENING THE STARTER VALVE MANUALLY AND IT STARTED TO SLOW, APPEARING THE L DRIVE AND L GEN OFF IN SUPERIOR PANEL MESSAGES AND L GEN OFF AND L DRIVE OFF EICAS MESSAGES COME ON. DURING REVISION WAS DETECTED OIL LEAK IN LEFT IDG; THE DPI WAS REVISED, BUT FAIL CONTINUED. AIRCRAFT WAS SENT TO THE HANGAR AND LEFT IDG WAS REPLACED IAW MM 24-11-01, TESTED CORRECT.