As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO SIDE TONE OR STATIC ON HF1 COULD RECEIVE SEL CAL THOUGH HF/SAT 1 TRANSFER SW IN HF. WHEN PUSHING HF/SAT 1 TRANSFER SWITCH, STATIC AND VOICE COULD BE HEARD ON HF1. ONLY WHEN THE SWITCH WAS IN TRANSIT. ACFT GROUNDED. CLEANED HF/SAT TRANSFER SWITCHES. INSPECTED CONNECTOR ON PANEL-CHECKED OK. REPLACED NR 1 HF TRANSCEIVER IAW AMM 23-11-21. PERFORMED TRANSCEIVER BITE TEST IAW AMM TASK 23-11-801. BITE PASSED. PERFORMED GROUND RADIO CK IAW AMM 23-11-00. NR 1 HF & NR 2 HF CHECKED OK. GROUND VERIFY SUCCESSFUL.