As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON PURGING WITH GREASE OF THE MAIN ROTOR GRIP IT WAS NOTICED THAT GREASE WOULD NOT COME OUT OF THE VENT FITTING AT THE TOP OF THE GRIP. THE ROTOR HUB WAS REMOVED AND DISASSEMBLED TO FIND EXCESSIVE WEAR ON THE FITTING AT THE SEAL CONTACT AREA ALLOWING GREASE TO PASS THROUGH INTO THE YOKE.