As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT LOST HYDRAULIC QTY ON NR 2 SYSTEM WENT DOWN TO .6 QTS. RETURNED TO GATE. UPON INVESTIGATION FOUND LEFT OUTBOARD SPOILER ACTUATOR LINE LEAKING, MECHANICS INSTALLED A TEMP FLEX LINE. GROUND RAN AIRCRAFT, LEAK CHECK GOOD. SERVICED NR 2 HYDRAULIC SYSTEM AS REQUIRED.