As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT HF COMM ISSUES. DUE TO REPETITIVE HITS IN AHM ON THE RT HF ANTENNA COUPLER HAVING AN INTERNAL FAULT (MESSAGE 23-51012) WHICH STARTED SHORTLY AFTER IT WAS INSTALLED AND IS PRESENT ON MOST LEGS. 1. REPLACED THE RT HF ANTENNA COUPLER PER AMM 23-11-03. ESTABLISHED AUDIO COMMS AND RECEIVED CALL ON RT AND LT HF RADIOS. SYSTEM OPS CHECKED NORMAL.