As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SMOKE IN CABIN WITH EITHER ENGINE BLEED SELECTED AND LAV SMOKE INDICATION. MAINTENANCE DETERMINED SMOKE COMING FROM AN OIL LEAK INTERNAL TO THE NR 1 ENGINE. MAINTENANCE REMOVED AND REPLACED NR 1 ENGINE PERFORMED OPERATIONAL AND LEAK TESTS. THE AIRCRAFT WAS APPROVED FOR RETURNED TO SERVICE.