As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE FROM TOL TO ANC, THE FLIGHT CREW NOTICED A DECLINE IN THE MAIN HYDRAULIC QUANTITY SYSTEM. THE FLIGHT CREW FOLLOWED COMPANY PROCEDURES AND CONTINUED TO ANC FOR AN UNEVENTFUL LANDING. MAINTENANCE INSPECTED THE AIRCRAFT WHICH REVEALED A LOOSE FITTING AT THE SWIVEL GLAND IN THE MAIN GEAR ACTUATOR. MAINTENANCE TIGHTENED THE FITTING AND PERFORMED A SUCCESSFUL OPERATIONAL CHECK IAW THE DOUGLAS MM. THE AIRCRAFT WAS RETURNED TO SERVICE.