As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HF INAUDIBLE AND EXTREMELY GARBLED AND UNUSABLE FOR RECEPTION. SEEMS TO TRANSMIT FROM EITHER CAPT OR FO PANEL. MULTIPLE FREQUENCIES WERE ATTEMPTED WITH NO IMPROVEMENT IN RECEPTION. ACFT GROUNDED. ACCOMPLISHED T/S IAW FIM 23-11 TASK 806. REPLACED NR 1 HF TRANSCEIVER IAW AMM 23-11-21. OPS CHECK NORMAL. DEFECT CLEARED.