As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF 1 RADIO UNABLE TO TRANSMIT NOR RECEIVE ON BOTH ACP'S. GROUNDED - YES. REMOVED AND REPLACED HF #1 TRANSCEIVER PER B737-900 AMM 23-11-21. PERFORMED GOOD INSTALLATION TEST OF HF #1 PER AMM 23-11-21-400-801. PERFORMED GOOD HF #1 SYSTEM TEST PER AMM 23-11-00-730-801. GROUND VERIFICATION TEST PASSED.