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 #2. WHEN KEYING THE MIC TO TALK THE SIDE TONE COMES ON AND STAYS ON. IT IS A CONTINUOUS TONE UNTIL THE RADIO IS TUNED TO ANOTHER FREQUENCY. GROUNDED - YES. ACCOMPLISHED OPS CHECK WITH NO FAULTS FOUND REF B737-800 AMM 23-11-00. HF #2 KEYS AND TRANSMITS NORMALLY. GROUND VERIFICATION TEST SUCCESSFUL.