As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH HF-1 SELECTED "FAIL" LIGHT INDICATED ON BOTH COMM PANELS. GROUNDED - YES. ACCOMP B737-800 FIM 23-11 TASK 803 FOR HF TRANSCEIVER FAIL PROBLEM. PULLED & RESET HF-1 C/B, "FAIL" INDICATIONS EXTINGUISHED IN BOTH RTP FREQ WINDOWS AND HF TUNING FREQS APPEARED WITH HF-1 SELECTED. HF-1 BITE TEST & OPS NRML REF FIM 23-11 TASK 803. ETOPS SIGNIF SYS - GND VERIFICATION SUCCESSFUL.