What was found
THE NR 2 ENGINE LOST PARTIAL POWER WHILE IN CRUISE FLIGHT FROM HNL TO NRT. THE EPR DROPPED FROM 1.40 TO 1.13 AND N1 DROPPED FROM 95 PERCENT TO 85 PERCENT. THE AIRCRAFT WAS RETURNED TO HNL WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 2 ENGINE PS4 LINE TO THE 3.5 BLEED CONTROLLER CRACKED. THE LINE WAS REMOVED AND REPLACED IAW MM 75-31-14. A POWER ASSURANCE RUN CHECKED GOOD.