What was found
IMMEDIATELY AFTER RAISING, THE LANDING GEAR HANDLE AFTER TAKEOFF, ALL (A) SYSTEM HYDRAULIC PRESSURE WAS LOST AND THE EICAS INDICATED 4 PERCENT HYDRAULIC FLIUD REMAINING. THE MAIN LANDING GEAR RETRACTED AND THE NOSE GEAR REMAINED DOWN. FOUND "NWS" CETERING HYD LINE RUPTURED. REPLACED LINE WITH NEW. REPLACED THE REMAINING 3 HOSES PN'S: AS116-06K0166 PER REQUEST. INSPECTED ALL OTHERS CHECK GOOD. REPLACED AUX PUMP CASE DRAIN FILTER PN: CPD750-29-1. PERFORMED BLEED, LEAK, AND OPERATIONAL TESTS OF ALL RELATED SYSTEMS ALL CHECKS SATISFACTORY. REF 750 MM CH'S 12-10-15, 29-20-04, 29-10-02, AND 32-42-00.