As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF1 RADIO SHOWS FAIL FAIL ON THE AUDIO CONTROL PANEL WHEN SELECTED. GROUNDED - YES. DURING TROUBLESHOOTING OF HF1, FOUND THAT HF1 TESTED OK PER B737-800 AMM 23-11-21-400-801. NO FAULTS WITH HF-1 SYSTEM, BUT FOUND #2 HF TRANSCEIVER INOP WITH NO POWER. REPLACED #2 HF TRANSCEIVER PER AMM 23-11-21-400-801.