As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT EXPERIENCED HYDRAULIC FAILURE IN FLIGHT. SPLINES BETWEEN HYDRAULIC PUMP AND DRIVING PULLEY FOUND WORN. SPLINES ARE GREASED EVERY 500 HOURS. TT 409.5 HOURS. SPLINE MAY NOT HAVE BEEN GREASED SUFFICIENTLY. WHEN AIRCRAFT WAS ASSEMBLED.