As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 HF RADIO HEAD DISPLAYS "FAIL" ON BOTH ACTIVE & STANDBY FREQUENCY WINDOW- RADIO DOES RECEIVE & TRANSMIT. GROUNDED - YES. REBOOTED #2 HF XCVR HF BITE CK OK REF. B737-800 FIM 23-11 TASK 801 ALSO RADIO CK W/ SFO LOUD & CLEAR ON HF2. ETOPS GND VERIFICATION COMPLETE.