As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NR 3818 REPORTED TOTAL LOSS OF NR 2 HYDRAULIC SYSTEM CONTENTS. PRESSURE LOSS WAS FOR APPROX. 7 MINUTES, WITH NR 2 ENGINE RUNNING. MAINTENANCE FOUND UNION ON THE ASSOCIATED HYDRAULIC PRESSURE MANIFOLD TO HAVE A BAD O-RING. O-RING WAS REPLACED AND THE SYSTEM INSPECTED IAW CHECK 5-50-33. SYSTEM WAS SERVICED AND BLED AS NEEDED, AND OPERATIONAL CHECKS AND LEAK CHECKS WERE GOOD.