If you want to execute maintenance on your own GAS GAS EC 450 FSR then it is usually a great idea to have a Workshop Manual to keep just for personal reference just in case you want to know easy methods to strip off a certain part for example, the Drive Shaft and fit it again accordingly.
GAS GAS EC 450 FSR Workshop Manuals provides certain diagnostic facts on your car or truck so if something is broken it helps you determine what the situation is and the way to repair it. You will be able to evaluate if this can be done on your own or if the job is just too big it is possible to book your EC 450 FSR into a decent friendly mechanic.
GAS GAS EC 450 FSR manual