As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF #2 NO TRANSMIT. RECEIVES OKAY. GROUNDED - YES. PERFFORMED HF SYSTEM FAULT ISOLATION PER B737-800 FIM 23-11 TASK 806. #2 TRANSCEIVER PASSED BITE TEST SO SWAPPED #1 & 2 TRANSCEIVERS. PROBLEM FOLLOWED #2 TRANSCEIVER SWAPPED TRANSCEIVERS BACK TO ORIGINAL POSITION AND REPLACED #2 TRANSCEIVER. OPS TEST GOOD FOR 1 & 2 TRANSCEIVER. REF B737-800 AMM 23-11-21. GROUND VERIFICATION SUCCESFUL.