If you choose to do fixes to your Sachs LF 125 then it is always recommended to have a Workshop Manual for a guide should you need to know tips to remove a certain part for instance the Door and match it again in the correct way.
Sachs LF 125 Workshop Manuals gives you unique diagnostic guides for the automobile therefore if something is broken it helps you determine what the problem is and some ways to resolve it. You can then evaluate if this can be done yourself or that the job is too big you are able to book your LF 125 in to a decent car garage.
Sachs LF 125 manual