As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: HF RADIO INOP RIGHT SIDE. SIDETONE WORKS, TRANSMITTER DOESN'T ON CAPTAIN, FO, AND MAINTENANCE PANEL SIDES. RETURNED TO PHNL PRIOR TO ENTERING OCEANIC AIRPSACE. CORRECTIVE ACTION: PERFORMED FIM FAULT TREE 804 STEP 41, CHECKED GOOD. SWAPPED ANTENNA COUPLERS AND THE PROBLEM MOVED TO LH. ONLY CAN TRANSMIT ON 5.574. REPLACED LH HF COUPLER IAW AMM 23-11-00 OPS CHECK IAW AMM 23-11-00 OPS CHECK GOOD.