What was found
(CAN) THE PILOT REPORTED THAT AT DEPARTURE, WHEN STARTING TO LEVEL OFF WITH NO POWER ADJUSTMENTS, HEARD & FELT 3 COMPRESSOR STALLS, REDUCED POWER SLIGHTLY TO ABOUT 98% & HEARD & FELT 2 ADDITIONAL STALLS, SWITCHED BLEED AIR FROM BOTH ENGS TO LT ENG ONLY & REDUCED POWER TO ABOUT 96%. THE PILOT PERFORMED AN AIR TURN BACK, NO FURTHER STALLS WERE NOTED.