As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN HF 2 SELECTED ON AUDIO CONTROL PANEL "FAIL" IS SHOWN IN ACTIVE AND STANDBY WINDOWS. GROUNDED - YES. PERFORMED FIM 23-11 TASK 801. NR 2 HF COMM SYSTEM BITE TEST FAILED. REMOVED AND REPLACED NR 2 HF TRANSCEIVER REF AMM 23-11-21. GROUND VERIFICATION NORMAL.