As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF1 RADIO SHOWS FAIL/FAIL. GROUNDED - YES. NORMAL OPERATION RETURNED AFTER HF-1 BITE CK. NOTICED DURING RECEPTION THAT COMMUNICATION WAS WEAK AND GARBLED REGARDLESS OF SENSITIVITY SETTING. REMOVED & REPLACED #1 HF RT. OP CK NORMAL. REF B737-800 FIM 23-11 TASK 801.