As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROPELLER WAS DISASSEMBLED TO CHECK FOR GREASE LEAK. HUB EDDY CURRENT INSPECTED PER INSTRUCTIONS SB 164, AND DEFECT NOTED IN ONE BLADE SOCKET. PHOTOS TAKEN OF HUB AND EDDY CURRENT TEST OF HUB. HUB RED TAG (REJECT) ALL OTHER PARTS GREEN (SERVICEABLE). HARTZELL SB NR 164 WARNS, 'UNEXPLAINED VIBRATION OR GREASE LEAKAGE INCIDENTS DEMAND IMMEDIATE INSPECTION FOR CRACKED HUB'.