As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH RADIO TUNING PANELS SHOW "INOP" IN BOTH WINDOWS WHEN HF 2 SELECTED. GROUNDED - YES. VERIFIED #2 HF LOCKED UP. RESET #2 HF SYSTEM. RETURNED TO NORMAL, #2 HF BITE IS GOOD REF B737-800 FIM 23-11 TASK 801- GRD VERIFICATION SUCCESSFUL.