As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HF RADIO AUDIO GARBLED, UNINTELLIGIBLE. SWITCHED TO HF 2 AND ON SAME FREQUENCIES THAT HAD BEEN IN USE ON HF 1, NORMAL COMMUNICATION QUALITY RESUMED. ACFT GROUNDED. ACCOMPLISHED HF COMMUNICATION SYS BITE PROCEDURE REF FIM 23-11/801, OPS CHECKED GOOD. GROUND VERIFICATION SUCCESSFUL REF FIM 23-11/806 HF COMMUNICATION SYS RECEIVE/TRANSMIT PROBLEM FAULT ISOLATION.