design – Modelling Software Maintenance process in BPMN 2.0 notation

Fellow Stackers,

I have a question in my mind. Currently, I am studying Software Engineering and I have homework that I need to model a software maintenance process with BPMN 2.0 notation. But I have no idea about the software maintenance process and its activities. Can I get some information about it so I can start modelling from somewhere. Thanks in advance.