The "usual suspects" along with what laser mentioned. I keep a close eye on little things being broken or needing repaired or adjusted. (The plastic clip that holds the hood prop in place when not in use for example. Or broken/ loose interior pices/ panels, any lights burned out) I believe if the owner took the time to take care of the little things, chances are that they took care of the big ones too. (Folowing maintainence schedules, oil changes etc.)