As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD 3 LO PRESS MESSAGE IN FLIGHT. DIVERTED. (FLT#5440) REMOVED AND REPLACED THE FAULTY O-RING AND BACKUP RING IAW AMM. LEAK CHECK SATISFACTORY. SERVICED AND BLED THE HYDRAULIC SYSTEM #3 IAW AMM. NO LEAKS NOTED AND NO DEFECTS NOTED AT THIS TIME.