What was found
(CAN) TURNED THE LEFT DCMP OFF RT AFTER TAKEOFF AND THEY LOST ALL LT SYSTEM IN CRUISE. GROUND INSPECTION FOUND THAT FLEX PIPE WAS FRETTED THROUGH CAUSING THE FLUID LEAK. R & R RUPTURED LINE. CLEANED ALL RESIDUAL FLUID. R & R LT EDP. R & R PRESSURE, RETURN AND BOTH CASE DRAIN FILTERS. FLUSHED SYS THEN REPLACED PRESSURE, RETURN AND BOTH CASE DRAIN FILTERS AGAIN. SERVICED SYSTEM AND COMPLETED FUNTIONAL CHECKS. OPS AND LEAK CHECK GOOD. CLEANED ALL RESIDUAL FLUID.