As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR INTERRUPT, RETURNED, & EMER DECLARED. LANDING UNEVENTFUL & ACFT NOT OVERWEIGHT. DURING CRUISE LT HYD SYS QTY BEGAN TO DECREASE SLOWLY. ON ARRIVAL FOUND RT OTBD AILERON POWER CONTROL UNIT LEAKING FROM PLUG. R & R RT OTBD POWER CONTROL UNIT IAW AMM 27-11-11. PERFORMED ADJUSTMENT IAW AMM 27-11-00. SYS CHECKED NORMAL.