As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON 2 SEPARATE OCCASIONS, THE NR 1 HF RADIO FAILED TO TUNE PROPERLY. WE EVENTUALLY USED HF NR 2 FOR COMMUNICATIONS AS HF NR 1 WAS UNRELIABLE. ON THE SECOND OCCASION, THE RADIO WOULD NOT TRANSMIT AFTER BEING TUNED. ACFT GROUNDED. R & R NR 1 HF R/T IAW AMM 23-11-21, OPS NORMAL. SUCCESSFUL TRANSMIT, ACCOMPLISHED AND SUCCESSFUL SELCAL RECEIVED. GROUND VERIFICATION SUCCESSFUL. CLEARS MEL 23-11A.