As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HF RADIO FAILED ENROUTE. FAIL DISPLAYED IN FREQUENCY WINDOW. ACFT GROUNDED. CONFIRMED THAT HF-1 LRU FAILED. CONFIRMED NR 1 HF TRANSCEIVER FAILED. REPLACED THE NR 1 HF TRANSCEIVER. OPS NORMAL IAW AMM 23-11-21. GROUND VERIFICATION GOOD.