As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO TRANSMIT ON HF 1 OR 2 . INTERMITTENT RECEPTION WITH HF 2 AND HF 1. ACFT GROUNDED. REMOVED AND INSTALLED LT HF ANTENNA COUPLER, SN 188938, REF AMM 23-11-61. PERFORMED LT HF SYS TEST REF AMM 23-11-00. SYS CKS NORMAL. REMOVED AND INSTALLED RT HF ANTENNA COUPLER, SN 177493, REF AMM 23-11-61. PERFORMED RT HF SYS TEST REF AMM 23-11-00. SYS CKS NORMAL.