Abstract: A method for diagnosing problems in tape libraries is disclosed. In one embodiment, such a method includes attaching, to a robot of a tape library, one or more scanning devices to scan internal components and features of the tape library. As the robot moves within the tape library, the method captures, using the one or more scanning devices, three-dimensional (3D) data describing physical locations of the internal features and components. This 3D data is compiled to generate a map of the internal components and features. The method compares the map to a 3D model of the tape library to identify differences between the map and the 3D model. Problems within the tape library may be identified from these differences. A corresponding system and computer program product are also disclosed.