What was found
CAPTAIN REPORTED THAT AT 39,000 FEET, LEFT ENGINE STALLED, DESCENDING TO 27,000 FEET WITH OSCILLATIONS IN N1 AND N2 WITH ENG CONTROL L AND ENG EEC C1 L MESSAGES, LANDING AT GRU. AT GRU, TECHNICAL PERSONNEL CONFIRMED THE MESSAGES AND PERFORMED FIM 71-05 TASK 806 AND FIM 75-21 TASK 822 PROCEDURES, ALL CORRECT. BOROSCOPIC INSPECTION WAS PERFORMED FOUNDING 6 BLADES OF HPC DAMAGED WITHIN LIMITS AND ONE FIRST STAGE HPT BLADE WITH DAMAGES OUT OF LIMITS. THE PT25 SENSOR AND EEC WERE REPLACED IAW MM 73-21-63 AND ENGINE STALL INSPECTION WAS PERFORMED IAW MM 71-00-00-200-809-G00, TESTED CORRECT. THE AIRCRAFT WAS DISPATCHED AS A FERRY FLIGHT TO CHICAGO STATION IAW GENERAL ELECTRIC CDR CA-07-0490 APPROVING THE ENGINE OPERATION 3 CYCLES MORE IN THIS CONDITION AND THE FAA SPECIAL FLIGHT AUTHORIZATION NO. SW23002008-01, TO REPLACE THE ENGINE.