Not sure about the newer models, but on mine the dinette slide motor is mounted on the outside, sandwiched between the inside edge of the basement compartments and the outside of the frame rail heat shield. You access it from under the coach. There is a lever you can pull to disengage the worm gear so the slide can be moved manually, although it takes three strong men and a boy do do it!
Bob - Folsom CA
2008 Fleetwood Southwind 35A, Workhorse W-22 8.1
Acme EZE Tow Dolly - 2007 Honda Odyssey