As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEG- AFTER TAKEOFF NOTICED SMOKE IN THE CABIN. THE LAVATORY SMOKE DETECTOR ALSO WENT OFF. AIRCRAFT RETURNED TO THE FIELD AND MADE AN UNEVENTFUL LANDING. SERVICED BOTH THE COCKPIT AND CABIN COOLING TURBINES. PERFORMED THE BLEED AIR SYSTEM BLOW OUT PER MAINTENANCE TASK CARD NR 8301001. NO FURTHER SMOKE NOTED. AIRCRAFT RETURNED TO SERVICE. NO COMPONENTS REPLACED. REFERENCE ODR NR QXEA9700583 FOR CORRECTIVE ACTIONS INVOLVING THE APU.