As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER MAIN ROTOR BLADE CHANGE, DURING TRACK AND BALANCE, ROTOR SYS WOULD NOT RESPOND TO NORMAL CORRECTIONS. REMOVED ROTOR HEAD AND DISASSEMBLED TRUNION ASSY, FOUND "THRUST WASHER" FACE FLAKING OFF AND EFFECTING CENTERING. REPLACED THRUST WASHER AND RE-CENTERED TRUNNION. TRACK AND BALANCE NORMAL.