As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH ENGINES RUNNING, PILOT NOTICED PIECES COMING OUT OF SPINNER. DURING INSP, DISCOVERED THAT THE LT SPINNER SUPPORT WAS COMING APART. AND SEVERAL PIECES FELL ON THE GROUND. THE SPINNER WAS NOT PROPERLY SHIMMED CAUSING THE SPINNER SUPPORT TO BE LOOSE AND VIBRATING DURING ENGINE RUN. INSTALLED A NEW SPINNER SUPPORT AND SHIMMED AS REQUIRED.