Switch or the controller.. Mine is the controller.. Now that you have found it's a power gear I will give you the party line, and what I found (not the same)
Party line is a 3/4 inch nut on one end (usually toward the vehicle rear) You release the brake (Lever under a rubber cap on the motor) and wrench it in.. Easy peasy right (NOT ON YOUR LIFE at least on my RV)
I wound up using a pipe wrench on the square shaft and all the strength I had.
After that I went to the gears on each end. Pulled the hair pin. Knocked the gear (And shaft) to the side (Toward the tranny) so it released Collected the plastic bushing/washer thing and just pushed the slide in and out by hand.. I'm over 300 pounds and over 6' tall so I can get real real pushy Out was easy. in was a witch (Push in just a couple inches at one end. then the other (2x that Then 2x that on the first end. and keep this up for about oh say six or 8 inches THen get pushy and push in as far as you can) Use the locking rod when it's in Very tight. To push out I have a spot in the center which happens to be the end of a couch. I bumped each end out a few inches to make room. then putting my back against the kitchen cabinets I put my feet against the couch and straightened my legs. As I said I'm very pushy.