As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT NR 2409, THE CREW REPORTED SMOKE IN THE CABIN DURING FLIGHT. IT WENT AWAY AFTER 1 MINUTE. THE AIRCRAFT LANDED IN CLE WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND FOUND A OIL LEAK AT THE FRONT FRAME AREA. THE NR 2 ENGINE WAS REPLACED. UPON ENGINE TEARDOWN THE ROOT CAUSE OF THE SMOKE IN THE CABIN WAS THE ZERO CARBON SEAL'S TEFLON LIP SEAL.