What was found
AFTER TAKEOFF AT ABOUT 600 AGL, HYD SYS 1 LOW QTY, HYD 1 SYS LOW PRESSURE HYD 1 SYS 1 FAIL, RUDDER SYS 1 INOPERATIVE AND AILERON 1 SYS 1 PRESSURE DROPPED TO ZERO, SYS 1 QTY DROPPED TO ZERO. DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE. LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. R & R THE LT HYD MANIFOLD ASSY IAW AMM 29-10-07. NO LEAKS NOTED. OPS CHECKED GOOD. ACFT RETURNED TO SERVICE.