If you need to do fixes on your Piaggio NRG Power DD then it will always be recommended to possess a Workshop Manual to use as reference should you need to know tips to strip off a certain part such as the Wheel Bearing and match it again in the correct manner.
Piaggio NRG Power DD Workshop Manuals provide you with unique diagnostic info for the automobile so if something is faulty it can help you understand what the issue is and how to fix it. After that you can evaluate if this can be achieved on your own or in case the job is too big you can make a reservation for your NRG Power DD right into a suitable repair garage.
Piaggio NRG Power DD manual