As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED HYDRAULIC 1 LOW PRESSURE MESSAGE AT 600 FEET AGL. QUANTITY WAS ZERO. CREW RAN QRH, RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND UNION LEAKING ON ENGINE DRIVEN PUMP. MAINTENANCE R & R NR 1 ENGINE EDP AND PERFORMED CHECKS IAW AMM. AIRCRAFT RELEASED FOR SERVICE.