If you choose to undertake fixes to your BMW R 850 RT then it is usually a good idea to have a Workshop Manual to use as personal reference if you want to know proven methods to strip off a specific component for example Door and fit it again appropriately.
BMW R 850 RT Workshop Manuals can offer you exact diagnostic wisdom with regards to your automobile therefore if something is playing up it can help you determine what the problem is and methods to make it better. You will be able to decide if you can do this by yourself or that the job is just too big you can still make a reservation for your R 850 RT into a suitable car garage.
BMW R 850 RT manual