What was found
FLT 478 - HNL-OAK/LAS - AFTER MX ACTIONS, DEPARTED HNL AND HAD NR 2 BLEED TRIP OFF, CLIMBING THROUGH 25,000 FEET. RESET AND TRIPPED AGAIN AT 26,500 FEET. RETURNED TO HNL, UNEVENTFUL LANDING. REPLACED WORN KISS SEAL P/N 32895625, (FAN AIR VALVE) JUST AFT OF NR 2 ENGINE PRECOOLER CONTROL VALVE, P/N 82C100201. REPLACED THE NR 2 ENGINE PRECOOLER CONTROL VALVE AS A PRECAUTION IAW MM 36-12-02, PAGE 401-408. OPS CHECK OK ON GROUND. AIRCRAFT RETURNED TO SERVICE. (M)