As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LEFT ENGINE RUNNING ROUGH IN CRUISE. MAINTENANCE INSPECTED AND FOUND THE NUMBER TWO CYLINDER EXHAUST VALVE BROKEN AND PUSHROD BENT. ENGINE HAS BEEN REMOVED FOR TEARDOWN ANALYSIS; FURTHER DETAIL WILL BE PROVIDED UPON RECEIPT OF TEARDOWN REPORT.