What was found
NON-ETOPS FLT 266 HNL-OGG, AFTER TAKEOFF, HYD SYS QUANTITY INDICATION DROPPED TO 1.5 GAL. AND SYSTEM A LOW PRESSURE LIGHT ILLUMINATED. CREW RETURNED TO HNL WITHOUT FURTHER INCIDENT. MAINTENANCE SERVICED HYDRAULIC RESERVOIR TO FULL, PERFORMED ENGINE RUN, OPERATED HYDRAULIC SYSTEM AND CONDUCTED A VISUAL INSPECTION NR 1 ENGINE CASE DRAIN FILTER. NO HYDRAULIC SYSTEM LEAKS NOTED. FOUND NR 2 ENGINE HYDRAULIC SYSTEM A PUMP LOW PRESSURE LIGHT INTERMITTENT. MAINTENANCE REMOVED AND REPLACED THE NR 2 ENGINE DRIVEN HYDRAULIC PUMP, IN ACCORDANCE WITH AMM 29-11-31. ENGINE RUN AND LEAK CHECK VERIFIED OK.