As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAIN ROTOR SERVO BLEW OUT SERVO PISTON SEAL. THIS EMPTIED THE NR 2 HYRAULIC PUMP/RESERVOIR MODULE. CREW WAS NOTIFIED BY ILLUMINATION OF THE NR 2 TAIL ROTOR AND MAIN ROTOR SERVO AND HYDRAULIC PUMP AND LOW RESERVOIR LOW FAIL LIGHT. REPLACED UNSERVICEABLE LT MAIN ROTOR SERVO AND THE NR 2 HYDRAULIC PUMP/RESERVOIR MODULE.