As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 3812 THE CREW REPORTED THE GREEN AND BLUE HYDRAULIC LOW LEVEL WARNING CAME ON INFLIGHT. THE CREW DECLARED A EMERGENCY AND LANDED IN CLEVELAND WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND FOUND A O-RING LEAKING ON A UNION ON THE BLUE SYSTEM HYDRAULIC FILTER. THE O-RING WAS REPLACED AND THE SYSTEM WAS SERVICED AND PRESSURE CHECKED. THE AIRCRAFT WAS RELEASED FOR SERVICE.