As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SMOKE IN CABIN DURING CLIMB OUT OF MKE AND RETURNED TO FIELD AND LANDED AT MKE WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT AND FOUND ACM NR 2 TO BE AT FAULT, PLACED ON MEL 21-51-00-1, AND THE A/C WAS THEN RETURNED TO SERVICE.