As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A PREFLIGHT INSPECTION, HYDRAULIC FLUID WAS FOUND UNDER THE FORWARD PORTION IF THE TAIL BOOM. INVESTIGATION FOUND TAIL ROTOR SERVO LEAKING. AREA WAS CLEANED AND HYDRAULIC POWER UNIT WAS RUN ON AIRCRAFT TO LOCATE LEAK. SERVO WAS LEAKING FROM THE SHAFT TWICE THE ALLOWABLE LEAK RATE AND THE SERVO WAS ALSO LEAKING FROM A NON SERVICABLE PLUG ON THE HOUSING. UNIT WAS REPLACED WITH SERVICABLE UNIT.