I understand your wanting to have that manual, it's a great, in-depth, back-up to understanding/figuring-out a potential problem or fault. And "it's better to have it and not need it, than to need it and not have it."
However, the Maintenance Manual can be very pricey... especially for something you'll (hopefully) never need. I mean, when was the last time you read your Owners Manual? After the initial one or two times, it's simply been a maintenance schedule/procedure reference.
The only time that I've required the Maintenance Manual for my 4105, I called my Dealership and they downloaded/sent me the pertinent schematic(s) at no charge at all.