What was found
FLIGHT 6426, CMH TO JFK - DURING CLIMB AT 500FT AGL, THE FLIGHT ATTENDANT CONTACTED THE FLIGHT DECK WITH A CABIN EMERGENCY. THE FLIGHT ATTENDANT REPORTED SMOKE ENTERING THE CABIN. THE FLIGHT CREW REPORTED THAT THERE WAS NO SMOKE AT ANY TIME IN THE COCKPIT. THE FLIGHT RETURNED TO LAND AT CMH WITHOUT INCIDENT. MAINTENANCE PERFORMED A VISUAL INSPECTION OF BOTH ENGINES WITH NO PRESENCE OF OIL LEAKAGE, RAN BOTH ENGINES WITH NO OIL OR SMOKE SMELL IN CABIN, AND INSPECTED BOTH PACKS AND DUCTING WITH NO DEFECTS NOTED IN ACCORDANCE WITH FIM 21-20-00-810-803-A AND AMM 72-00-00.