If you wish to undertake fixes on your TGB R50X then it is usually a good plan to own a Workshop Manual to keep just for personal reference if perhaps you want to know the right way to remove a particular component for example, the Brake Discs and install it again in the correct way.
TGB R50X Workshop Manuals offers you specific diagnostic guidelines on your vehicle so if something is broken it helps you find out what the problem is and the way to resolve it. Then you are able to determine if this can be done by yourself or that the job is simply too big you can make a reservation for your R50X in with a trusted repair garage.
TGB R50X manual