As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POST FLT NR 5560 - STL - SMOKE IN CABIN AFTER PARKING AT GATE. SMOKE SEEMED TO CLEAR OUT AFTER CLOSING NR 2 PACK AND APU BLEED. MAINTENANCE INSPECTED THE CABIN LIGHTING AND PERFORMED AN OPS CHECK OF THE AIRCRAFT BLEED SYSTEMS WITH NO DEFECTS NOTED.