As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
# 1 HF RADIO FAILED AT CRUISE, WILL NOT TRANSIMIT. GROUNDED - YES. OBSERVED INTERMITTENT TRANSMIT. ACCOMPLISHED HF COMM BITE REF B737-800 FIM 23-11-00. NO FAULTS RETURNED. PER HISTORY AND OBSERVED INTERMITTENT TUNING AT MULTIPLE FREQUENCIES REPLACED #1 HF COUPLER REF B737-800 AMM 23-11-61. 2 EA CBS PULLED TAGGED AND RESET. INSTALLATION TEST GOOD. ETOPS GROUND VERIFICATION SUCCESSFUL ON MULTIPLE FREQUENCIES.