As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AT FL350 IN CRUISE, NR 2 B HYDRAULIC PUMP OVERHEAT LIGHT CAME ON. PUMP WAS SELECTED OFF. 30 SECONDS LATER THE NR 1 B HYDRAULIC PUMP LOW PRESSURE LIGHT CAME ON. PUMP WAS SELECTED OFF, B HYDRAULIC SYSTEM QUANTITY DROPPED TO 1.2 GALLONS. AIRCRAFT RETURNED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND A STEADY DRIP FROM THE B SYSTEM AILERON POWER CONTROL UNIT. B PUMP CASE DRAIN FILTERS INSPECTED, NO CONTAMINATION FOUND. NEW FILTERS INSTALLED. AILERON SYSTEM B POWER CONTROL UNIT REPLACED AS PER WORK CARD 51148.