What was found
THE A/C LOST NR 2 SYSTEM HYDRAULIC FLUID WHILE ENROUTE FROM HNL TO GUM. THE FLUID LOSS WAS ACCOMPANIED BY ILLUMINATION OF BOTH LT AND RT PUMP PRESSURE LOW LIGHTS. THE NR 2 HYD QTY LOSS CHECKLIST WAS PERFORMED, FUEL WAS DUMPED, AND THE A/C WAS RETURNED TO HNL WHERE IT LANDED WITHOUT INCIDENT. MX FOUND THE NR 2 ENG RT ENG DRIVEN HYDRAULIC PUMP CASE CRACKED. BOTH THE RT AND LT NR 2 ENG DRIVEN HYDRAULIC PUMPS WERE REMOVED AND REPLACED. IN ADDITION, THE RT HYDRAULIC PUMP PRESSURE LINE WAS REPLACED DUE TO LEAKAGE. THE HYDRAULIC SYS WAS SERVICED. THE NR 2 ENGINE WAS RUN AND LEAK AND OPERATIONAL CHECKS WERE GOOD.