What was found
ON DEPT GOT L HYD FLUID ALL FLUID W/ 0/ZERO HYD IND...PTU ON STA TUS PG PER CREW DEBRIEF. SHORTLY AFTER TAKE-OFF AND DURING GEAR RETRACTION, CREW NOTICED L HYD FLUID LOSS TO 40% THEN 0%. LEFT GEAR STAYED DOWN. NOSE GEAR AND RIGHT GEAR RETRACTED STAYING UP. POWER TRANSFER UNIT STATUS MESSAGE RIGHT AFTER LOSS OF L HYD. CREW PERFORMED ALTERNATE GEAR EXTENSION AND FLAPS DUE TO LOSS OF HYD FLUID PER QRH FOR LANDING. LH MLG DOWNLOCK ACUTATOR FOUND TO BE LEAKING HYDRAULIC FLUID. LH MLG DOWNLOCK ACTUATOR REMOVED AND REPLACED. FLAGGING SDR, REF LOGPAGE 9101644 FOR INFO AND CORRECTIVE ACTION REPLACED DOWN LOCK ACTUATOR REF LP 9101644