If you want to execute maintenance tasks on your Derbi Senda DRD Pro 50 SM then it will always be recommended to have a Workshop Manual to keep just for reference in the event you want to know how you can remove a specific part for example Wheel Bearing and install it again in the correct manner.
Derbi Senda DRD Pro 50 SM Workshop Manuals are able to offer specific diagnostic facts on your car so if something is not working it will help you understand what the issue is and how to repair it. You will be able to decide if you can do this by yourself or if ever the job is just too big you can still make a reservation for your Senda DRD Pro 50 SM in with a local mechanic.
Derbi Senda DRD Pro 50 SM manual