As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF RADIO FVR FAILED/UNSAT. HF1 ABLE TO RECEIVE SELCAL, UNABLE TO RECEIVE OR TRANSMIT VOICE. HF2 UNABLE TO RECEIVE SELCAL , ABLE TO RECEIVE AND TRANSMIT VOICE. GROUNDED - YES. REPLACED #1 & #2 COUPLERS PER B737-800 AMM 23-11-61 PB 400 OPS CHECK GOOD IAW AMM 23-11-61 ACCOMPLISHED HF COMMUNICATION SYSTEM TEST AND SELCAL, OPS CHECK GOOD IAW AMM 23-11-00 AND 23-28-00.