As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PROPELLER WAS RECENTLY OVERHAULED BY AN APPROVED O/H FACILITY. AFTER INSTALLATION ON THE AIRCRAFT, THE PROPELLER WOULD EMIT A LOUD NOISE AND VIBRATION AT/OR NEAR 100 PERCENT POWER. THIS VIBRATION AND NOISE IS BELIEVED TO BE FROM BLADE FLEX ON THE PROPELLER AND IS MAINLY PRESENT DURING STATIC POWER RUNS.