As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FEEDBACK IN BOTH HF RADIOS. FOUND LEFT AND RIGHT HF TRANSMIT NORMAL, BUT BOTH RECEIVE UNREADABLE AND GARBLED. REPLACED LEFT AND RIGHT ANTENNA COUPLERS M241 AND M242 REF MM. PERFORMED HF COMMUNICATION SYSTEM TEST REF MM. HF SYSTEM OPERATES NORMAL.