What was found
NON-ETOPS FLIGHT 278 HNL - KOA, AFTER TAKEOFF, NR 1 ENGINE HYDRAULIC SYSTEM A LOW PRESSURE LIGHT ILLUMINATED. CREW DISENGAGED ENGINE DRIVEN HYDRAULIC PUMP AND RETURNED TO HNL WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND CHANGED HYDRAULIC SYSTEM A CASE DRAIN FILTERS, PRESSURE MODULE FILTERS AND RETURN FILTER. LEAK CHECK OK. NO FLUID CONTAMINATION NOTED. MAINTENANCE CONDUCTED A GEAR SWING CHECK WITH NO DEFECTS FOUND. AIRCRAFT WAS RETURNED TO SERVICE.