As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH HF-2 SELECTED IN ACP, THE WORD "FAIL" APPEARS IN BOTH THE ACTIVE AND STANDBY WINDOWS OF THE ACP. HF-2 TRANSMISSIONS CAN BE HEARD OK. ACFT GROUNDED. PERFORMED BITE TES OF NR 2 HF COM SYS IAW 23-11, TASK 801 FIM, NO FAULTS NOTED AT THIS TIME.