As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY ONE AND HALF (1.5) HOURS AFTER TAKE OFF, HYDRAULIC QUANTITY DROPPED TO THE STAND PIPE. FOUND DEFECTIVE O-RING ON ENGINE DRIVEN PUMP PRESSURE LINE FITTING RT ENGINE DRIVEN PUMP. REMOVED AND REPLACED O-RING IAW MM 29-10-12; OPS CHECKED NORMAL ON ENGINE RUN-UP AND NO LEAKS FOUND. ALSO SERVICED HYDRAULIC RESERVOIR BLEED SYSTEM SEVERAL TIMES DURING ENGINE RUN-UP IAW MM 12-30-1 & 71-00. AIRCRAFT RETURNED TO SERVICE.