If you wish to conduct fixes on your own Vespa Granturismo GT 125L then it is always a good idea to have a Workshop Manual to use as a reference in case you want to know the best ways to take off a particular part for example the Wheel Bearing and install it again successfully.
Vespa Granturismo GT 125L Workshop Manuals will give you distinct diagnostic guidelines on your car or truck so if something is wrong it can help you understand what the situation is and the way to resolve it. After that you can determine if this can be done by yourself or in case the job is just too big you can actually make a reservation for your Granturismo GT 125L in with a trusted mechanic.
Vespa Granturismo GT 125L manual