As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO TRANSMIT ON NR 1 HF. NR 2 HF OPERATES NORMALLY. ACFT GROUNDED. CONFIRMED FAULT, UNABLE TO COMMUNICATE WITH NR 1 HF SELECTED. KEY INTERLOCK LIGHT ON NR 1 HF TRANSCEIVER ON WHEN MIC KEYED. NO TUNE IN PROGRESS TONE WITH MIC SELECTED OR SIDETONE. REPLACED NR 1 HF TRANSCEIVER IAW MM 23-11-21. OPS NORMAL. VERIFIED TUNE IN TONE AND SIDETONE PRESENT. VERIFIED COMMUNICATION HF NR 1 SYSTEM GROUND VERIFICATION GOOD.