As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING INSPECTION HYDRAULIC FLUID FOUND VERY LOW, DETERMINED FLUID WAS LEAKING OUT OF THE VENT CAP ON HYDRAULIC RESERVOIR. FLUID TOPPED UP TO CENTER OF SIGHT GLASS. AIRCRAFT GROUND RAN, DETERMINED FLUID WAS RISING IN RESERVOIR AND VENTING OUT OF VENT CAP. RESERVOIR SENT TO MFG. REINSTALLED AFTER REPAIR, GROUND RAN AND FOUND HYDRAULIC LEVEL TO STAY AT CENTER OF SIGHT GLASS. (TC NR 20070306001)