As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WRITE-UP BY PILOT STATED PROPELLER WAS SLINGING GREASE ON BLADES. MAINTENANCE INSPECTION FOUND GREASE ZERK FITTING HAD FAILED INTERNALLY AND THE CHECK BALL AND SPRING WAS PUSHED INTO THE PROPELLER HUB BY GREASE PRESSURE WHEN HUB WAS SERVICED AT LAST 100-HOUR INSPECTION.