As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT, FLIGHT 4416, FLIGHT ATTENDANT NOTICED POSSIBLE SMOKE IN CABIN. SMOKE ODOR IN COCKPIT. NO FIRE INDICATIONS. AIR RETURNED TO DEPARTURE. FLIGHT ATTENDANT STATED THAT IS SEEMED TO COME FROM THE FLOOR VENTS. REMOVED AND REPLACED RIGHT ENGINE ASSY IAW AMM 71-00-00-04. OPS AND LEAK CHECKED GOOD.