What was found
AFTER T/O AT AROUND 3,000'' GOT THE RSVR LIGHT ON HYD PANEL LEFT SIDE ALONG WITH L HYD QTY RF .32 & DROPPING; FOLLOWED SHORTLY BY L-HYD PRESSURE DROPPING RAPIDLY; COMPLETE LOSS OF LEFT HYD SYSTEM NO PTU. READ QRH FOLLOWED PROCEDURES; UNEVENTFUL, LANDING. REMOVED AND REPLACED BLOWN LT GEAR DOWN LOCK ACTUATOR LINES, REPLACED NR 1 ENG ENG DRIVEN HYD PUMP IAW AMM 29-11-05-004-085. LEAK AND OPS CHECK NORMAL ENGINE RUN PERFORMED ALL STATUS MESSAGES RESET ROTABLE PARTS CHANGE WAS INDICATED - TT 1473195 S/N OFF 00507 PUMP, HYD ENG D OFF 19-2910-9-0003 0507, ON 19-2910-9-0003 0935.