As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF #1 RADIO DOES NOT TRANSMIT, IT DOES RECEIVE. GROUNDED - YES. REMOVED AND REPLACED #1 HF ANTENNA COUPLER REF B737-900 AMM 23-11-61-400-801. #1 HF SYSTEM OPERATIONAL TEST AND SYSTEMS TEST OP GOOD, REF AMM 23-11-00-730-801 AND 23-11-00-710-801. THIS CLEARS MEL 23-11A.