g) For cars with engine problems, the mechanical repairs division firstly examines the car engine. Depending on the damage and the number of damaged parts, the parts are either repaired, or new parts are needed, or both cases apply for different damaged parts. For repairable parts, the mechanical repairs division uses specialized manufacturer's software and repairs the single parts. In the second case, the division purchases new parts directly from supplier (specialized software used). Once the parts have been repaired or the new parts have been delivered, they have to be installed. When the engine is ready, the mechanics start it up. If the engine works properly, the problem is solved. In any other case a problem still exists and the mechanical repairs division has to examine the engine once more, performing all steps again.