HI Adamh..
I have a DR250 & a friend managed to find the Clymer manual online so gave it to me on a CD (don't know where from). Try ADV and Thumper web sites.
If you are unable to find it, drop me a PM and I may be able to put it on t'internet for downloading - burning one may take a while as my PC is knackered.
NB: I found the CD copy to be a pain - it's just 1 big image-like file so you can't scroll to page X - so in the end I bought a paper manual - easier to read and flick through...