As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HF TRANSMIT IS INOPERATIVE. CAN HEAR SIDETONE WHEN TRYING TO TRANSMIT BUT SFO RADIO CAN'T HEAR YOU. GROUNDED - YES. ACCOMPLISHED HF-1 COMMUNICATION OPERATIONAL TEST REF B737-800 AMM 23-11-00 TEST PASSED. COMMUNICATIONS WITH SFO WITH AC ON GROUND REPORTED AS 3X3.