As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HF HAS NO AUTOTUNE, OR TRANSMIT. ALSO, NO AUDIO WHEN ATC TRANSMITTING ON NR 2 HF. ATTEMPTED TO TRANSMITT ON CAPTAIN`S, F/O`S AND HAND MICROPHONES WITH SAME RESULTS. ACFT GROUNDED. REPLACED NR 1 HF TRANSCEIVER. OPS CHECKED GOOD IAW AMM 23-11-21.