As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) RECEIVED MAIN ROTOR HUB FOR REPLACEMENT OF TIME EXPIRED COMPONENTS. WHEN DISASSEMBLED FOUND THAT BOTH OTBD EXCLUDERS IN GRIP ASSEMBLIES WERE NO LONGER RETAINING THE LUBRICANT AND ALLOWING IT TO PASS INTO THE YOKE SPINDLE BORES. THE INBD BEARING CONTACT AREA WITH THE YOKE DID NOT HAVE SUFFICIENT LUBRICATION AND DETERIORATION OF THE YOKE SPINDLE (DEEP PITTING) OCCURED. THE YOKE WAS SCRAPPED.