The issue seems to be way too long to provide you with the answer here. ABB PBS case study usually takes several pages of full description to explain the point. For example, this paper, as a case study example, takes whole 6 pages to provide the reader with a decent amount of information to reveal the point:
You may use it as an example of performing a case study. Also, I hope you’ll find the information you need on the issue to complete your research.
The case study will provide you with the main points of the problem and the direction you may follow when developing own point of view on the situation.
Still, if you have no time to complete your paper, you may use some of the StudentShare services, like
Hide a Paper and Rewrite - thus you’ll get the unique paper on the issue, or
Writing service - get the writer to perform research for you under your requirements.