As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 478 KOA-OAK - DURING CRUISE FLIGHT, CREW NOTED THE NR 2 HF RADIO WOULD NOT TRANSMIT VOICE. CREW CONTINUED TO OAK WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED A BITE CHECK AND AN OPERATIONAL CHECK WITH NO FAULT FOUND PER AMM 23-11-00. AIRCRAFT WAS RELEASED FOR SERVICE AND A SUCCESSFUL FLIGHT VERIFICATION WAS COMPLETED ON THE NEXT FLIGHT LEG.