As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A PREFLIGHT INSPECTION ONE OF THE MAIN ROTOR HUB DROOP STOP FOLLOWER ROLLER SHAFTS WAS FOUND PROTRUDING DOWNWARD FROM THE PLUNGER ASSEMBLY. FURTHER INSPECTION FOUND THAT THE COTTER PIN HAD WORN INSIDE THE ROLLER SHAFT AND HAD LOST ITS RETAINING ABILITY.