What was found
(CAN) SHORTLY AFTER TAKEOFF, FLIGHT CREW RECEIVED THE DOOR WARNING LIGHT/FUSELAGE DOORS LIGHT ILLUMINATED. FLIGHT CREW RAN THROUGH CHECKLIST & DECIDED TO DECLARE A NON-EMERGENCY AIR RETURN. ATC WAS NOTIFIED. UPON LANDING, RAMP STAFF WAS WAITING FOR THE ACFT. AT THE START FEATHER, THE AFT BAGGAGE DOOR WAS PROPERLY CLOSED & THE CAUTION LIGHT THEN EXTINGUISHED. FLIGHT CREW RECEIVED A DOOR WARNING LIGHT IN FLIGHT AND RETURNED FOR INVESTIGATION. ON ARRIVAL,THE RAMP ATTENDANT CONFIRMED THAT THE AFT BAGGAGE DOOR HANDLE WAS OUT AND NOW THE HANDLE HAD BEEN RE-SECURED. MAINTENANCE TESTED THE HANDLE AND CONFIRMED THAT IT WAS WORKING AS ADVERTISED.