As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE IN THE CABIN REPORTED BY PAX AND FLIGHT ATTENDANT WHILE CLIMBING THROUGH FL 200. RETURNED TO BASE. SMOKE WAS REPORTED AROUND THE VICINITY OF ROW 10. REMOVED AND REPLACED CEILING LIGHT BALLAST AT 12AB. OPS CHECKED A/C FOR 30 MIN. OPS CHECKED GOOD AT THIS TIME. (SEE ALSO FAX SIR #2011011500049/SWIA201125396)