As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE RT POWERPACK FILTER BOWL HAD A HYDRAULIC LEAK IN FLIGHT, THE POWERPACK WAS PARTIALLY EMPTY. THE LANDING GEAR WAS MANUALLY DESCENDED AND THE PILOT DECLARED AN EMERGENCY. MECHANIC REPLACED FILTER ASSY (460635) WITH O-RING (MS 28778-16) THE POWER PACK WAS SERVICED, GEAR SWING CARRIED OUT, LEAK CHECKED SERVICEABLE. (TC NR 20070814004)