What was found
(CAN) MAINTENANCE INSPECTED THE AIRCRAFT, FOUND MAIN 60A CB TRIPPED RESET CB AND SYSTEM APPEARED TO FUNCTION NORMAL FURTHER INVESTIGATION FOUND HYDRAULIC PUMP WOULD INTERMITTENTLY (ONLY OCCUR ON FIRST SYSTEM POWER UP) INTERNALLY BYPASS CAUSING LOW PRESSURE OUTPUT AND PUMP RUN-ON UNTIL CB WOULD TRIP INVESTIGATION OF THE SYSTEM FOUND WIRE (SPRING MATERIAL) IN FIRST CHECK VALVE OFF PUMP AND MAIN FILTER HYDRAULIC PUMP REPLACED, SYSTEM FLUSHED AND FUNCTION CHECKED. (TC NR 20060529009)