If you wish to undertake maintenance tasks on your Lem CX3 SR then it will always be a good idea to possess a Workshop Manual to use as a reference in case that you want to know the way to remove a specific part for instance the Door and match it again properly.
Lem CX3 SR Workshop Manuals provide you with specified diagnostic information for your car so if something is broken it helps you identify what the issue is and the best way to correct it. You will be able to determine if you can do this yourself or if the job is simply too big you could book your CX3 SR in to a suitable repair garage.
Lem CX3 SR manual