What was found
HNL/KOA - FLT 92 - PILOT REPORT: A-SYSTEM FAILURE AFTER GEAR RETRACTION ON TAKEOFF. DECLARED EMERGENCY. QRH AND STANDARD PROCEDURES FOLLOWED. LANDING UNEVENTFUL. AIRCRAFT TOWED TO RAMP. REPLACED NR 1 ENGINE DRIVEN HYD POWER IAW MM 29-11-32, PAGES 401-405, PRECAUTIONARY. OPS AND LEAK CHECK OK. PN 65075-06. REPLACED NR 2 ENGINE DRIVEN HYD POWER IAW MM 29-11-32, PAGES 401-405 DUE TO FAILURE. OPS CHECK AND LEAK CHECK OK, PN 65075-06. REPLACED SWIVEL FITTING ASSY ON LT MAIN GEAR ACTUATOR. OPS RETRACTION CHECK OK. LEAK CHECK OK. AIRCRAFT RETURNED TO SERVICE. (X)