What was found
ON CLIMB-OUT FROM RNO, AFT CARGO DOOR WARNING LIGHT ILLUMINATED. RETURNED TO RNO. INVESTIGATION REVEALED AFT CARGO DOOR TO BE CLOSED AND SECURED. PLACE ITEM ON MEL 52-3, DEPARTED RNO TO BOI. AFTER ARRIVAL IN BOI, ADJUSTED AFT CARGO DOOR WARNING SWITCH. CLEARED MEL, PLACARDS REMOVED.