As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HF SHOWS FAIL IN BOTH WINDOWS. ACFT GROUNDED. UNABLE TO CONFIRM ORIGINAL DISCREPANCY, FAIL DID NOT SHOW IN WINDOW. WHILE TRYING TO COMMUNICATE ON HF NR 1, FOUND TRANSMIT AND RECEIVE TO BE GARBLED AND UNABLE TO UNDERSTAND EACH WAY. REPLACED NR 1 HF TRANSCEIVER. OPS NORMAL IAW AMM 23-11-21. COMMUNICATED BETWEEN ACFT FOR HF NR 1 AND FOUND TRANSMIT AND RECEIVE TO BE CLEAR EACH WAY. GROUND VERIFICATION GOOD IAW AMM 23-11-00, OPS AND SYSTEM TEST.