What was found
PILOT WROTE UP "SPARKS COMING FROM LEFT EXAUST POWER REDUCTION'.
MAINTENANCE FINDINGS:
INSPECTED LAST STAGE TURBINE DISC, COMBUSTION LINER, FIRST STAGE COMPRESSOR BLADES AND CT DISC BLADES. NO OBVIOUS DISCREPANCIES NOTED. PERFORMED ENGINE PERFORMANCE RUN. ALL PARAMETERS WITHIN LIMITS. CONSULTED PWC AND AMC SERVICE ENGINEERING, ENGINE DEEMED SERVICEABLE SUSPECT CARBON OR OIL DEBRIS TO BE CAUSING THIS ISSUE.