As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH FL 280, F/A`S REPORTED SMOKE IN CABIN. COULD SMELL SMOKE IN THE COCKPIT AS WELL. EMERGENCY DECLARED AND RETURNED TO DEPARTURE. TROUBLESHOT AND FOUND NR 2 ACM SEIZED. R & R THE NR 2 ACM IAW AMM 21-51-05. OPS CHECKED GOOD.