As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF 1 RADIO TRANSMISSION PROBLEM ALL STATIONS BOTH CAPT AND FO SIDE. FAULT CODE: 231 080 48. GROUNDED - YES. R & R HF1 TRANSCEIVER IAW B737-800 AMM 23-11-21-000-801 INSTALLED IAW AMM 23-11-21-400-801. PERFORMED OPS CHECK PER AMM SUB TASK 23-11-21-740-008.