I just replaced mine. The referenced motor is part # provided by REV for my '08 Discovery 40X. It may be the same on yours.
It is straight forward. My awning was stuck about 18" extended. Easy to work on after inserting cotter pins. 3 rivets to drill out; new ones came with the motor.
BTW, REV wanted $593 and a local supplier $598. I found it on eBay for $459, shipping included. New, not rebuilt. Lots on Amazon and others on eBay ran more.
Dometic 3307923.115U Black WeatherPro