As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ATTENDANT REPORTED SLIGHT HAZE, FUMES, AND THE AFT LAV SMOKE DETECTOR SOUNDED DURING TAKEOFF. SYMPTOMS LASTED A COUPLE OF MINUTES THEN CLEARED AND THE ALARM STOPPED. FLIGHT RETURNED TO AN UNEVENTFUL LANDING AT MSP. MAINTENANCE REPLACED THE RIGHT ACM AND WATER SEPARATORS AND CLEARED DUCTS OF RESIDUE. RAN PACKS FOR TWO HOURS. NO HAZE OR SMELL DEVELOPED. AIRCRAFT RETURNED TO SERVICE.