As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF RADIO #1 TRANSMITS BUT DOES NOT RECEIVE RECEPTION IS COMPLETELY GARBLED AND ILLIGEBLE. GROUNDED - YES. PERFORMED HF BITE REF B737-800 FIM 23-11 TASK 801 NO FAULTS NOTED. PERFORMED FIM 23-11 TASK 806 PERFORMED A OPS CHECK ON HF1 & HF 2 MULTIPLE FREQUENCY NO DEFECTS NOTED.