robotics how to paper

[xmanrex123]

ok i am writing a how to paper for my english class and i am doing it over repairing an andymarke super shifter gearbox mounted to the 2013 kit of parts frame but i need responses from frc team mentor for supporting evidence for the paper so i was wondering if anybody can help me and explain what is the easiest ways to detect and identify problems with in an andymark super shifter that has stopped working what would be my first steps of diagnostics so i can use this in my english class.