If you choose to perform fixes on your Triumph T 140 V Bonneville Special then it is always a good idea to have a Workshop Manual to use as personal reference in the event you want to know ways to take off a particular component for example the Door and fit it again properly.
Triumph T 140 V Bonneville Special Workshop Manuals provide you with exact diagnostic information with regards to your vehicle so if something is playing up it can help you find out what the issue is and methods to correct it. After that you can evaluate if you can do this on your own or if ever the job is simply too big you could book your T 140 V Bonneville Special in with a trusted friendly mechanic.
Triumph T 140 V Bonneville Special manual