If you can successfully crank it in manually aren't you driving it through the slide motor gear box? I looked on line...it appears that year was an 'above the floor' electric slide...the new ones are now Schwintek 'in the wall' slides. As it's above the floor, the drive mechanism should be inside the camper...under a cabinet, sofa whatever depending on your floor plan. Can you do more investigation?
Nights camped in 2013 - 55, 2014 - 105, 2015 - 63