As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SYSTEM-A HYDRAULICS DECREASED FROM 103 PERCENT TO 55 PERCENT INFLIGHT, RETURNED TO BASE. UPON INSPECTION OF NR 1 ENGINE HYDRAULIC PUMP, FOUND QUICK RELEASE FITTING LOOSE, CAUSING LOSS OF FLUID. RESECURED QUICK RELEASE FITTING ON NR 1 ENGINE DRIVEN PUMP. SERVICED SYSTEM-A HYDRAULICS AND OPERATIONALLY CHECKED PUMP IAW BOEING AMM 29-11-11, OPS CHECKED GOOD AND NO LEAKS NOTED.