As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NUMBER 1 HF RADIO HAS NO SOUND OR SIDETONE. GROUNDED - YES. WENT TO BITE NR 1 HF TRANSCEIVER, FOUND NR 1 HF TRANSCEIVER INOP. R & R NR 1 HF TRANSCEIVER, REF AMM 23-11-21-000-801/400-801. PERFORMED NR 2 HF BITE TEST AND OPS CHECK. NR 1 HF OPS NORMAL.