As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HF RECEIVES BUT UNABLE TO XMIT, ALL THREE STATIONS.CREW DECIDED TO PERFORM AIR TURN BACK AS A PRECAUTION. AIRCRAFT WAS GROUNDED BY MAINTENANCE. CIRCUIT BREAKER WAS CYCLED IAW AMM 23-11-715-203, OPS NORMAL. OVERWEIGHT LANDING PERFORMED. AIRCRAFT RELEASED ETOPS 180.