As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH HF1 & HF2 RADIOS GARBLED AND UNREADABLE FROM BOTH SFO RADIO AND OTHER ENROUTE TRAFFIC. ACFT GROUNDED. PERFORMED FIM 23-11, TASK 806, HF NR 1 & NR 2 OPERATE NORMAL. RECEIVE AND TRANSMIT TO SFO WAS HEARD LOUD AND CLEAR, ACFT OK FOR SERVICE. GROUND FUNCTIONAL CHECK SUCCESSFUL.