As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5887 DURING CLIMBOUT OF CVG, SMOKE (ODOR) WAS NOTED IN CABIN AND COCKPIT, CREW DECLARED AN EMERGENCY, RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. PERFORMED A VISUAL INSPECTION OF CABIN LIGHTING, OPERATED APU AND AIR CONDITIONING PACKS. DISCREPANCY COULD NOT BE DUPLICATED.