What was found
DURING TAKEOFF AT ROTATION, FLIGHT CREW EXPERIENCED COMPRESSOR STALL ON NR 2 ENGINE. FLIGHT ENGINEER NOTED A 6 PERCENT DROP IN N-1 SPEED. DURING INITIAL CLIMB-OUT, CREW NOTED SECOND COMPRESSOR STALL. AIRCRAFT RETURNED TO POINT OF DEPARTURE, LANDING WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED BORESCOPE WITH NO FAULTS FOUND. AS A PRECAUTION, THE MAIN ENGINE CONTROL AND COMBUSTION INLET TEMPERATURE SENSOR WERE REPLACED. GROUND RUN PERFORMED AND ALL PARAMETERS NORMAL. ACFT RETURNED TO SERVICE. (X)