If you need to accomplish fixes on your own Honda CB 250 RS then it is always a great idea to possess a Workshop Manual for a reference in case that you need to know proven methods to strip off a particular component for example, the Door and install it again safely.
Honda CB 250 RS Workshop Manuals will provide you with unique diagnostic info for the car so if something is broken it helps you work out what the issue is and tips on how to correct it. Then you are able to analyse if you can do this by yourself or if the job is simply too big you could make a reservation for your CB 250 RS into a suitable garage.
Honda CB 250 RS manual