As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3757 AFTER TAKEOFF LAVATORY SMOKE WARNING. FLIGHT ATTENDANT REPORTED LIGHT BLUE SMOKE IN CABIN. SMOKE DISSIPATED AFTER CABIN SMOKE PROCEDURE & AN EMERGENCY LANDING. THE ACFT WAS REMOVED FROM SERVICE. GND RAN ENGS AT TAKEOFF POWER & THE NR 2 PACK TEMP SET AT MIDWAY. DETERMINED NR 2 ENG PRODUCING BURNING SMOKE & SMELL IN CABIN. ENG ODOR EVENT. R & R NR 2 ENG IAW WC 71-00-00, OPERATIONS CHECKED GOOD.