As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROPELLER ASSEMBLY WAS REMOVED FOR EXCESSIVE VIBRATION. DURING DISASSEMBLY AND INSPECTION, IT WAS DETERMINED THAT THE VIBRATION WAS DUE TO THE UNEVEN WEAR OF THE BEARING INSERT. INSERT HAD DETERIORATED FROM .100\ TO .0875\ AT THE THINEST WALL TO .0995\ AT THE THICKEST WALL WEARING IN AN OVAL FASHION. BLADE AND BEARING WERE REMOVED FROM SERVICE AND REPLACED WITH SERVICABLE UNITS.