You won't find a 2018 but you can get upto a 2015 which is pretty much the same apart from the electronic suspension and dash
Triumph's electronic service manuals are here. https://www.tritun.net/tritun/user/loginForm?back=http://www.tritun.net/tritun/vehicle/lookupForm US$7.50/hour. You can pick out the parts you like and save/print them as PDFs and take with you on your phone. I got pretty much everything I wanted with 2 hours, which is only $15.00, so not bad. I've probably bought about 35 printed car and bike service manuals in my life and not once used the sections on engine or transmission teardown, emissions, etc. I like this new way. If you put your VIN in, you get the exact correct documents for your bike, and you may even see your own service history in there!
