As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLT 2542 THE CREW REPORTED SMOKE IN THE CABIN AFTER TAKEOFF. THE AIRCRAFT RETURNED TO CLE AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE NR 2 ENGINE. TEAR DOWN REPORT FROM ROLLS ROYCE INDICATED THE NR 0 CARBON SEAL RUNNER WAS THE PRIMARY FAILED ITEM THAT CAUSED THE ODOR. PRIOR TO ITS REMOVAL, THE NR 0 CARBON SEAL RUNNER COULD BE ROTATED BY HAND AND WAS FOUND WITH AN UNUSUAL AXIAL PLAY.