As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF 2 SHOWS FAIL FAIL MESSAGE. GROUNDED - YES. VERIFED FAIL FAIL ON FO'S RTP & HF TRANSCEIVER WILL NOT ENTER BITE. RESET #2 HF C/B = SAME RESULTS. REPLACED #2 HF TRANSCEIVER WITH SERVICABLE UNIT, INSTALLATION BITE TEST OK. REF AMM 23-11-21-400-801.