What was found
PILOT REPORTED ON GLIMB OUT AT 80 KNOTS HEARD A SERIES OF LOUD REPORT ON NR 1 ENGINE SIDE. MECHANIC INVESTIGATED BY INSPECTING XMSN AND DRIVETRAIN COMPONENTS AND NR 1 AND NR 2 ENGINES AND FOUND NO DEFECTS OR ABNORMALITIES. DOWNLOADED ENGINE DCU'S AND FORWARDED TO ENGINEERING FOR EVALUATION. NO DEFECTS NOTED. PERFORMED A HOVER CHECK AND FLIGHT AT 1200 FEET PER FOR POSSIBLE COMPRESSOR STALL. NO DEFECTS NOTED. ACFT RETURNED TO SERVICE.