As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF 1 HAS FAIL IN BOTH ACTIVE AND STANDBY BUT WHEN COM TRANSFER SWITCH IS PUSHED BOTH FREQUENCY'S RETURN AND VOICE AS WELL AS SIDE TONE SEEM TO WORK THEN FAIL MESSAGES RETURN. GROUNDED - YES. COULD NOT DUPLICATE, FAIL MESSAGE NOT PRESENT, ACCOMP B737-900 FIM 22-11 TASK 802. SYS OPS CKS NML. GROUND VERIFICATION SUCCESSFUL.