Users are encouraged to visit Dell's site directly and navigate within that. However, there are some pages on Dell's site that are of high utility to XPS 15 owners, and links to those pages will be located here - just because you've already come this far and it seems easier that way. We're including only links to ensure that all information directly associated with Dell remains within their corporate control for purposes of updates and edits.
Download the .pdf from Dell. If the service manual has been published for public consumption, I haven't found it yet. Please post here as soon as one surfaces!