As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4201 THE CREW REPORTED SMOKE COMING OUT OF EXHAUST ON SHUT DOWN OF NR 1 ENGINE. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NR 1 ENGINE SHAFT PLUG IAW RR MM 72-59-15. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.