As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT DIVERTED DUE TO A HYDRAULIC LOW QUANTITY INDICATION. HYDRAULIC INDICATION CONTINUED TO DECREASE BUT NEVER WENT TO ZERO. HYD 1 SYS LOW QTY MESSAGE IN FLIGHT. 2 PERCENT AFTER LANDING, 6 PERCENT AT GATE. NOTED HYD LEAK AT THE NR 1 ENGINE DRAIN MAST. FOUND THE NR 1 EDP LEAKING AT CASE HALVES. REPLACED THE EDP IAW AMM 29-11-01 & LEAK CHECKED GOOD. HYDRAULIC SYSTEM 1 SERVICED IAW AMM 12-12-01. OK FOR SERVICE.