As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 893 - AIR TURN BACK DUE TO B-SYSTEM HYDRAULIC WENT TO ZERO WITH LOW PRESSURE LIGHT ON. A-SYSTEM AT 2.5 GALLONS. REPLACED INBOARD B-SYSTEM HYDRAULIC PUMP AND FILTERS. REPLACED NR 5 SPOILER FILTER HOUSING PACKING. RESERVICED HYDRAULIC SYSTEM. OPS AND LEAK CHECK OK.