As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 5526 - ATL - CREW REPORTED SMOKE SMELL ALONG WITH VISIBLE SMOKE IN THE CABIN. MAINTENANCE INSPECTED THE AIRCRAFT'S AIR DISTRIBUTION SYSTEM AND IT'S PNEUMATIC BLEED SYSTEM. NO DEFECTS AND NO DUPLICATION OF DISCREPANCY COULD BE FOUND.