As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN #1 HF RADIO SELECTED FAIL APPEARS IN BOTH THE ACTIVE AND STANDBY RADIO TUNING PANEL DISPLAYS. GROUNDED - YES. INITIAL EVAL OPS NORMAL, WITH HF1 SELECTED NO FAIL INDICATIONS, BITE TEST PASS. DUE TO PREVIOUS HISTORY REPLACED HF1 TRANSCEIVER AMM 23-11-21, INSTL. TEST PASS, 1 EA. C/B OPENED AND RESET. ALSO ACCOMPLISHED HF1 SYSTEM OPERATIONAL TEST, ETOPS GROUND VERIFICATION SUCCESSFUL REF AMM 23-11-00-710-801.