As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF1 TUNES GOOD ON THE GROUND. WOULD NOT TUNE AIRBORNE REMOVED AND REPLACED HF TRANSCEIVER. OPS TEST FAILED. HF1 DOES NOT TUNNING-IN FOR HF 1 RADIO CALL OUT. REF AMM 23-11-21/ 401 HF1 TRANSCIEVER HAS BEEN REPLACED, NO JOY. TUNING BEEP IS CONTINOUS SUGGESTING HF1 CANT TUNE PROPERLY. RECCOMMED REPLACING 1 HF COUPLER. PART HAS BEEN ORDERED TO B29. REMOVED AND REPLACED #1 HF COUPLER REF AMM 23 -11-61 UPTO HF ANTENNA COUPLER INSTALLATION TEST.