As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO TRANSMIT ON HF #1. RECEIVING OK. ATTEMPTED MULTIPLE FREQUENCIES ON BOTH ACP'S, HF #2 OPS NORMAL. GROUNDED - YES. RESET SYSTEM AND PERFORMED OPS CHECK, GROUND FUNCTIONAL CHECK FOR THIS ETOPS SYSTEM GOOD IAW B737-800 AMM 23-11-00-730-801.