If you want to undertake fixes to your Triumph Daytona Super III then it will always be a good plan to have a Workshop Manual to use as personal reference in the event that you want to know tips on how to remove a particular component for example the Door and fit it again efficiently.
Triumph Daytona Super III Workshop Manuals will provide you with exact diagnostic info on your car so if something is broken it will help you figure out what the issue is and tips on how to fix it. You can then analyse if this can be done by yourself or that the job is simply too big you can still make a booking for your Daytona Super III in with a suitable car garage.
Triumph Daytona Super III manual