As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HF UNREADABLE ON ALL STATIONS. REPLACED THE NR 1 HF COUPLER IAW AMM 23-11-00, CONDITION SAME UNIT LEFT IN FOR FURTHER TROUBLESHOOTING. REPLACED THE NR 1 RMP IAW AMM 23-81-13. OPS CHECKED OK ON GROUND. CONTACT MADE. OK FOR SERVICE.