As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3887 - AFTER CLIMB-OUT, CREW RECEIVED LAVATORY SMOKE INDICATION. FLIGHT ATTENDANT VERIFIED SMOKE SMELL IN CABIN. AN EMERGENCY WAS DECLARED AND AIRCRAFT WAS LANDED SAFELY. MAINTENANCE COULD NOT DUPLICATE DISCREPANCY. SUSPECT PREVIOUS NIGHT ENGINE COMPRESSOR WASH TO BE THE CAUSE. GROUND ENGINE RUN AND BLEED SYSTEM OPERATIONAL CHECK WAS COMPLIED WITH AND NO SMELL WAS NOTED. AIRCRAFT WAS THEN RETURNED TO SERVICE. (M)