As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 648 ENROUTE, AIR TURNBACK, AFTER TAKEOFF, THE NR 1 PACK FAULTED FOLLOWED BY A BURNING ODOR ON THE FLIGHT DECK AND SMOKE IN THE CABIN. CREW ELECTED TO RETURN TO HNL. EMERGENCY DECLARED. LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE DISCOVERED OIL ON NR 1 PACK COMPONENTS. REPLACED THE AGB CENTRIFUGAL CARBON SEAL. ENGINE RUNS PERFORMED. OPS AND LEAK CHECKS GOOD.