As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE FOLLOWING A TOUCH AND GO LANDING THE CREW HEARD AN UNUSUAL METALLIC SOUND FROM THE ENGINE. THE CREW REMAINED IN THE PATTERN AND CONDUCTED A FULL STOP LANDING. UPON INVESTIGATION, THE #1 CYLINDER EXHAUST STACK WAS FOUND COMPLETELY CRACKED OFF ALONG THE WELD LINE AT THE FLANGE. STACK WAS REPLACED.