As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW RECEIVED A LOW HYDRAULIC QUANTITY LEVEL WARNING FOR THE GREEN SYSTEM (LEFT) SHORTLY AFTER TAKEOFF WHEN THE LANDING GEAR WAS SELECTED UP. THE GEAR WAS SELECTED DOWN AND THE AIRCRAFT RETURNED TO KVGT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE GREEN SYSTEM LOW ON HYDRAULIC FLUID. THE SYSTEM WAS REPLENISHED AND THE AIRCRAFT RETURNED TO SERVICE.