What was found
(CAN) DURING THE PRE-FLIGHT COCKPIT CHECKS WHILE THE AIRCRAFT WAS ON THE GROUND WITH ENGINES STARTED, THE PILOT NOTICED NR 2 HYDRAULIC PRESSURE LOSS. THE AIRCRAFT WAS SHUT DOWN FOR FURTHER INVESTIGATION. A HYDRAULIC LINE IN THE (HELL HOLE) WAS FOUND TO BE CHAFED BY A NEARBY BRAIDED LINE CAUSING FLUID LOSS AND THUS PRESSURE LOSS IN NR 2 HYDRAULIC SYSTEM. THE SUBJECT HYDRAULIC LINE WAS REPLACED WITH A NEW LINE AND THE BRAIDED LINE WAS CLAMPED TO PREVENT CONTACT WITH THE SURROUNDING LINES. THE AIRCRAFT HYDRAULIC SYSTEM WAS RE-FILLED AND THE AIRCRAFT GROUND RUN FOR LEAKS. NO LEAKS WERE FOUND AND THE SYSTEM PRESSURE WAS BACK TO NORMAL.