If you have to do fixes on your KTM 400 LC4 E then it is always a great idea to have a Workshop Manual to keep just for personal reference if perhaps you need to know tips to take off a particular component for example Door and install it again safely.
KTM 400 LC4 E Workshop Manuals can offer you detailed diagnostic information for the vehicle so if something is not working it can help you understand what the issue is and how to make it better. You can then evaluate if you can do this yourself or if ever the job is simply too big it is possible to make a booking for your 400 LC4 E in to a nearby friendly mechanic.
KTM 400 LC4 E manual