As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF FROM DEN, THE FLIGHT CREW NOTICED A DROP IN THE HYDRAULIC SYSTEM QUANTITY. THE FLIGHT CREW RETURNED TO DEN FOR AN UNEVENTFUL LANDING. MAINTENANCE INSPECTED THE AIRCRAFT WHICH REVEALED A LEAK AROUND THE LEFT AILERON PACK. MAINTENANCE REPLACED THE LEFT HAND AILERON POWER CYLINDER PER THE AIRCRAFT MAINTENANCE MANUAL AND RETURNED AIRCRAFT TO SERVICE.