As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT TURBOCHARGER TRANSITION ASSEMBLY WAS FOUND CRACKED FRONT AND BACK DURING ANNUAL INSPECTION OF AIRCRAFT. PILOT REPORTED CO DETECTOR CHIRPING ON TRIP TO ANNUAL. THIS CRACKED PART IS ATTACHES THE TURBOCHARGER TO THE RIGHT EXHAUST, FORWARD AND BELOW THE CABIN HEAT MIXING VALVE. FAILURE COULD CAUSE FIRE OR CO TO ENTER COCKPIT. CRACKS RAN FORE AND AFT ON THE INBOARD AND OUT BOARD SIDES OF THE TRANSITION ASSEMBLY ROUGHLY IN LINE WITH THE EXHAUST RISERS, CRACKED THROUGH APPROXIMATELY 75%