As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - FLIGHT ATTENDANTS REPORTED SMOKE IN CABIN ON CLIMBOUT. RETURNED TO DEN AND LANDED WITHOUT INCIDENT. SMOKE HAD DISSIPATED AT LANDING. ACCOMPLISHED WORK CARD 21-96-01. ACCOMPLISHED BURN OUT OF HIGH PRESSURE PNEUMATIC DUSTING PER MAINTENANCE MANUAL 21-20-02-2. SYSTEM GROUND CHECKED NORMAL OPERATION.