As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS: FLT. 476 OGG-SAN: DUCT PRESSURE GRADUALLY SPLITS DURING CLIMB, AT CRUISE SPLIT IS 23 PSI, LEFT - 19 PSI, RIGHT - 42 PSI. AIRCRAFT DIVERTED TO HONOLULU AND COMPLETED AN OVERWEIGHT LANDING WITHOUT INCIDENT. FOUND HIGH STAGE VALVE AND PRSOV PRESSURE SENSE LINE LEAKING AIR. REMOVED AND REPLACED HIGH STAGE VALVE IAW AMM 36-11-06-4. OPS AND LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.