If you want to do maintenance on your UM V2C 650S then it is usually recommended to possess a Workshop Manual to keep just for a reference in case that you want to know easy methods to remove a particular part for example the Door and fit it again successfully.
UM V2C 650S Workshop Manuals will give detailed diagnostic info on your vehicle so if something is wrong it can help you discover what the issue is and easy methods to fix it. Then you are able to assess if you can do this by yourself or if the job is just too big it is possible to make a booking for your V2C 650S in to a nearby mechanic.
UM V2C 650S manual