As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING LAG PIN REPLACEMENT BLADE WAS REMOVED. UPON REMOVAL OF BLADE HUB WAS INSPECTED AND THE PROBLEM WAS FOUND. THE UPPER SURFACE OF THE LOWER HUB HALF KRON BEARING SURFACE WAS WORN THROUGH TO METAL IN APPROXIMATELY 1/5 OF ITS CIRCUMFERENCE. NO INSPECTION CRITERIA WAS FOUND IN THE MM FOR THIS PARTICULAR INSTANCE SO HUB WAS RETIRED.