You can download it from CustomerSource or PartnerSource. If you don't have access to either one, contact your NAV partner, they will be happy to provide this manual for you.
Search it on partnersource or customersource? Probably. It's under training / certification if you can't. And if you can't find 4.0, 5.0 and 2009 haven't changed service management too much that I'm aware of.
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