As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO RECEIVE RADIO ON ANY FREQ, THEY USE ON HF 1. VERY GARBLED. HF 2 WORKS OK. HF 1 TRANSMITS FINE AND RECEIVES UTC FREQ. 5 X 5 AND SELCAL FUNCTIONS NORMAL. ACFT GROUNDED. PERFORMED HF COMMUNICATION SYSTEM TEST FOR HF-1 REF MM23-11-00. OPS NORMAL. NO FAULTS NOTED.