If you wish to perform maintenance on your Sachs Oliver Electro then it will always be recommended to own a Workshop Manual for a guide in case that you need to know how to remove a particular component including Exhaust and fit it again in the correct manner.
Sachs Oliver Electro Workshop Manuals will give certain diagnostic details for the vehicle so if something is broken it can help you identify what the problem is and methods to resolve it. Then you are able to evaluate if you can do this by yourself or in case the job is just too big you are able to book your Oliver Electro right into a local mechanic.
Sachs Oliver Electro manual