If you choose to perform maintenance tasks to your GAS GAS TXT 200 PRO then it is usually a good plan to have a Workshop Manual to use as a reference in case that you want to know tips on how to remove a specific component for example the Gearbox and fit it again properly.
GAS GAS TXT 200 PRO Workshop Manuals offer you targeted diagnostic info on your vehicle so if something is faulty it can help you understand what the problem is and some ways to repair it. You will be able to decide if you can do this by yourself or in case the job is too big you can make a reservation for your TXT 200 PRO in with a trusted garage.
GAS GAS TXT 200 PRO manual