As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) JUST AFTER TAKEOFF, THE CABIN STARTED TO FILL WITH SMOKE AND THE LAV SMOKE DETECTOR WENT OFF. THEY DECLARED EMERGENCY AND RETURNED TO THE FIELD. NO EVACUATION, SMOKE CLEARED ON LANDING. MX FOUND THE RT ENGINE NR3 CARBON SEAL TO BE FAULTY. MX REPLACED RT ENGINE (TC NR 20071113010)