As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON APPROACH TO WHITE SMOKE WAS OBSERVED EXITING THE LT INBOARD EXHAUST STACK. THE ENGINE WAS SHUT DOWN AND SECURED, THE A/C LANDED WITHOUT INCIDENT. UPON INVESTIGATION THE NR 3 CYL. EXHAUST VALVE STEM HAD SEVERED AND WAS INGESTED INTO THE CYL. OIL SCREENS WERE CHECKED AND CYL. CHANGED A/C RETURNED TO SERVICE.