As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED ATB DUE TO REPORTED SMOKE IN CABIN ON CLIMB OUT. AN EMERGENCY WAS DECLARED. MAINTENANCE REPLACED THE APU AND PERFORMED PACK SYSTEM INSPECTION/CLEANING. A VERIFICATION FLIGHT WAS ACCOMPLISHED AND THE ACFT WAS RETURNED TO SERVICE.