As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPLEMENTAL INFORMATION: HYDRAULIC QTY DROPPED 1% EVERY 2 MINUTES. LANDED WITH 50% HYDRAULIC QTY IN SYSTEM A ; / [01] FOUND A SYSTEM HYDRAULIC RETURN LINE FROM #1 ENG TR ISOLATION VALVE LOOSE. RE TORQUED PER AMM 20-50-11; NO LEAKS NOTED. SERVICED A SYSTEM HYDRAULICS PER AMM 12-12-00.