As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATL - FLIGHT ATTENDANTS REPORTED BURNING RUBBER SMELL WITH A HAZE IN AFT CABIN. EMERGENCY DECLARED FLIGHT RETURNED ATL LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. ACCOMPLISHED PACK BURN AND REPLACED COALESCER BAGS. SYSTEM GROUND CHECK NORMAL OPERATION.