As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF TRANSMISSION AND RECEPTION ARE WEAK, GARBLED, OR INTERMITTENT AT ALL CREW STATIONS. LEFT HF INOPERATIVE IN FLIGHT, CHECKED GOOD ON GROUND. REPLACED LEFT TRANSCEIVER AND LEFT COUPLER. COUPLER WILL NOW TUNE. ACCOMPLISHED GROUND VOICE COMM TEST. OPS NORMAL.