As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK, HYD FLUID LOSS. AIRCRAFT TOOK OFF FROM PHOENIX AND LOST HYDRAULIC FLUID IN THE 'A' SYSTEM. AIRCRAFT AIR RETURNED TO PHX. 'A' SYS AILERON PRESSURE LINE FOUND TO BE LEAKING. REMOVED AND REPLACED AILERON PRESSURE LINE OPS CK GOOD.