If you need to carry out maintenance on your own Aprilia ETX 350 AE then it is usually a good plan to own a Workshop Manual to keep just for a reference if you want to know techniques to take off a particular component much like the Dashboard and install it again accurately.
Aprilia ETX 350 AE Workshop Manuals will give you specific diagnostic guidelines with regards to your automobile so if something is wrong it can help you identify what the situation is and some ways to make it better. You will be able to analyse if this can be achieved yourself or in the event the job is just too big you could book your ETX 350 AE in to a nearby car garage.
Aprilia ETX 350 AE manual