As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF 1 APPEARS TO NOT TRANSMIT. ABLE TO LISTEN AND RECEIVE ON BOTH HF 1 AND HF 2. SELCAL CHECKS GOOD BOTH RADIOS. SATCOM OPERATES NORMALLY. GROUNDED - YES. REPLACED #1 HF COUPLER REF B737-9 AMM 23-11-61/401. ALL OP-CHECKS NORMAL. ETOPS GROUND VERIFICATION GOOD.