As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: HYDRAULIC HEAD PRESSURE DROPS TO ZERO, WILL NOT HOLD; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT SAN. SERVICED HYDRAULIC RESERVOIR HEAD PRESSURE, PER AMM 29-09-00. PERFORMED HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM LEAKAGE TEST, PER AMM 29-09-00. NO LEAKAGE FOUND. PRESSURE REMAINS CONSTANT AFTER 1 HOUR.