As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THEY RECEIVED A "HYDRAULIC SYSTEM 1 LOW QUANTITY" MESSAGE AFTER TAKEOFF. THE ACFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE SERVICED HYDRAULIC SYSTEM 1. OPS AND LEAK CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.