When you contact REV with your FIN # (not the VIN #--see tag below driver's mirror) tell them you need manuals for the tech package listed in the sales brochure. I tried to attach the brochure, but it is 14mb, too large for iRV2 (you can get it from REV or DOAI--it's often very useful). On page 8 is where the package is listed, so you can refer them to that:
I don't know where you are located, but there are chapters of the Discovery Owners club (DOAI) around the country who hold small rallies of usually 5 to 20 coaches. I suggest you join and try attending a rally--everyone loves to talk about their coaches and help each other.
https://www.discoveryowners.com/ The club also has an incredible forum focused on just Discovery coaches.
From REV or the DOAI forum I've tracked down every manual I've needed in PDF format. While I did get nearly all the manuals that came with my '08 Discovery (I was lucky; 3rd owner & 5-years old!), there are many more that were never included...especially not service manuals. Now I almost never look at paper--computer, phone or tablet are much easier!