As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - INFLIGHT T192/20 AFTER TAKEOFF CENTER HYDRAULIC SYSTEM QUANTITY WENT TO ZERO WITH R/F SHOWING CENTER SYSTEM PRESSURE LIGHT ILLUMINATED. RETURNED TO LAX AND LANDED WITHOUT INCIDENT. REPLACED NUMBER 1 SPOILER FILTER SEAL. ACCOMPLISHED OVERWEIGHT LANDING INSPECTION. SYSTEM GROUND CHECKED NORMAL OPERATION.