What was found
BOI FLIGHT NR 2345: AT APPROXIMATELY 8000 FEET, FUSELAGE DOOR WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO FIELD. MAINTENANCE, UPON ARRIVAL AT THE GATE, FOUND AFT BAGGAGE DOOR HANDLE IN THE OUT POSITION. VISUALLY INSPECTED HANDLE AND LATCH ASSY FOR DEFECTS. NONE FOUND. CW OPERATIONAL TEST OF THE AFT BAGGAGE DOOR IAW Q400 AMM 52-31-00-710-801. OPS TEST GOOD. NO DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.