As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT LEVEL OFF FL310 HYD NR 2 QTY DOWN TO 5.0 GAL. QTY WENT LOWER TO 2.7 GAL. PUMPS AUTO SHUTDOWN. DIVERT TO TPE. *S/D* REMOVED HYD TUB AND FAB TUB BY CHINA AIRLINES AND INSTALLED. REMOVED AND REPLACED HYD ENG MANIFOLD AND SYS MANIFOLD FILTER ELEMENTS PER MM 29-12-41-2. LEAK CHECK NORMAL.