As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF 1 SHOWS FAIL IN BOTH ACTIVE AND STANDBY. GROUNDED - YES. REMOVED & REPLACED HF 1 ANTENNA COUPLER PER B737-800 AMM 23-11-61. INSTALLATION TEST GOOD PER AMM 23-11-61. PERFORMED HF COMM STSTEM TEST PER AMM 23-11-00-730-801. BOTH HF 1 +2 TEST NORMAL.