As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF NR 1 RADIO IS WEAK AND HARD TO UNDERSTAND, IT TRANSMITS DATA WITH NO PROBLEMS. PERFORMED NR 1 HF COMM BITE CHECK PER FIM 23 11 00. CONFIRMED INTERLOCK FAULT. REMOVED AND REPLACED NR 1 HF ANT COUPLER PER AMM 23 11 61. REMOVED AND REPLACED NR 1 HF TRANSCEIVER PER AMM 23 11 21, NR 1 HF COMM SYS OPS NORMAL.