As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS FLIGHT 477 KOA-HNL: ON DESCENT, CREW NOTED FAILURE OF NR 2 FMC. CREW LANDED AT HNL WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED FIM TASK 34-61-00-810-807. NO FAULTS WERE FOUND. MAINTENANCE DOWNLOADED NR 2 FMC DATA IAW ENGINEERING. AIRCRAFT WAS RETURNED TO SERVICE. ANALYSIS OF THE NR 2 FMC DATA CONFIRMED A DROP TO SINGLE FMC OPERATION DUE TO A SOFTWARE NUISANCE FAULT. AIRCRAFT WAS RETURNED TO SERVICE.