If you have to accomplish maintenance to your BMW R 80 ST then it is always recommended to have a Workshop Manual to keep just for personal reference in case you want to know the best way to strip off a certain component for example the Dashboard and install it again the right way.
BMW R 80 ST Workshop Manuals gives you special diagnostic details on your vehicle therefore if something is faulty it will help you identify what the problem is and the way to correct it. You will be able to decide if this can be done by yourself or if the job is simply too big you can actually make a booking for your R 80 ST in to a decent repair garage.
BMW R 80 ST manual