AFAIK, there is no āservice manualā. Thereās an online service that you can get a subscription to, or pay per use. That gives you access to all of the service documentation, which you should be able to print or copy.
But if you scroll down to the thread, āCivic EX isnāt Startingā, someone posted a link to download a tech manual. I havenāt had a chance to look at it yet, but you could try that.