If you have to do maintenance tasks for your BMW R1200S then it is always a good idea to have access to a Workshop Manual to keep just for reference in case that you need to know methods to take out a specific component for example the Drive Shaft and match it again in the correct manner.
BMW R1200S Workshop Manuals gives you specific diagnostic wisdom on your car or truck so if something is faulty it can help you work out what the issue is and the way to correct it. You can then assess if you can do this by yourself or if ever the job is simply too big you could make a reservation for your R1200S in to a suitable friendly mechanic.
BMW R1200S manual