As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR FLIGHT 4221 THE CREW REPORTED THAT ON THE POST FLIGHT INSPECTION THEY NOTICED THE NR 1 ENGINE SMOKE FROM INTAKE. THE AIRCRAFT WAS REMOVED FROM SERIVICE. GROUND RAN NR 1 ENGINE IN ACCORDANCE WITH RR MM 72-00-00NO SMOKE NOTED AFTER SHUT DOWN, PERFORMED GENERAL VISUAL INPECTION OF NR 1 ENGINE INLET AND EXHUST AND NO DEFECTS WERE NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.