As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, HF 1 UNREADABLE ON ALL STATIONS. REPLACED NR 1 HF COUPLER PER AMM 23-11-00. CONDITION SAME, UNIT LEFT IN FOR FURTHER T/S. REPLACED NR 1 RMP PER AMM 23-81-13. OPS CHECK OK ON GROUND. CONTACT MADE WITH SFO. OK FOR SVC.