As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT DURING PREFLIGHT CHECKS, HYD FLUID WAS NOTED LEAKING IN THE REAR EQUIPMENT BAY. MX FOUND THE RESERVOIR WAS VENTING TO THE OVERBOARD DRAIN AND IDENTIFIED THE NORMAL ACCUMULATOR PRESSURE TO BE LOW AND LEAKING INTERNALLY INTO THE RESERVOIR. THE DEFECTIVE NORMAL ACCUMULATOR, PN AIR45574/3, SN APB960871 WAS R & R WITH AN O/H UNIT. REF: AMM 29-10-81. ACFT WAS RETURNED TO SERVICE.