As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING AN ENGINE START THE PILOT NOTED THERE WAS AN ABNORMAL NOISE GENERATING FROM THE ENGINE. THE NOISE WAS NOTICEABLE AROUND 10 PERCENT GG SPEED AND DISAPPEARED AFTER STABLE RPM WAS REACHED AT 17 PERCENT GG SPEED. THE STARTER GENERATOR WAS REPLACED AND THE NOISE HAS NOT REOCCURRED. NO FURTHER ACTION REQUIRED.