As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CANNOT TRANSMIT OR RECEIVE ON THE NR 1 OR 2 HF COMMS, WILL GET SIDE TONE ON INITIAL HF FREQ CHANGE. ACFT GROUNDED. VERIFIED CONNECTORS D8517 AND D345B AT E8-1 SHELF SECURE. PERFORMED HF 1 TRANSCEIVER BITE IAW FIM 23-11, TASK 801. BITE FAILED WITH KEYLOGGER LIGHT STAYING OFF DURING BITE. REMOVED AND REPLACED THE NR 1 HF TRANSCEIVER IAW AMM 23-11-21. BITE TEST PASSED.