As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, AT 4000FT F/A CALLED AND STATED SMOKE IN THE CABIN. PILOT AND F/O COULD SEE SMOKE AND DECLARED EMERGENCY, RETURNED TO AIRPORT. MAINTENANCE INSPECTED ACFT AND FOUND NR 2 ACM SEIZED. PLACED ON MEL. ON 8/4/15 MAINTENANCE R & R NR 2 ACM WITH OPS CHECK GOOD. ACFT WAS APPROVED FOR RETURN TO SERVICE.