As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAKEOFF AND CLIMB OUT PILOT REPORTED A CHANGE IN THE SOUND OF THE ENGINE. AIRCRAFT RETURNED. PILOT REPORTED ENGINE INDICATION NORMAL, NO ENGINE PERFORMANCE ABNORMALITIES. MAINTENANCE INSPECTED THE ENGINE OIL FILTER, NO FINDINGS, ENGINE WAS RUN WITH NO FAULTS FOUND. SUSPECT THE ENGINE INERTIAL SEPARATOR NOT STOWED CORRECTLY CAUSING INTAKE AIR DISTURBANCE. AIRCRAFT HAS BEEN RETURNED TO SERVICE.