Your tt looks to be built like mine with the non (super slide) type of slide. Meaning the slide is not built into the frame of the trailer but built above the floor level. Much cheaper this way. I had a slide issue last year not related to yours, but I did have to take all the inside access panels off. The small slide motors did have a socket end you would be able to use a ratchet or wrench to operate. Might take a while, but at least it's a option. I would make sure you have the tools to remove the panels just in case you needed to get to the slide motors. Mine had square shaped screw slots.
My issue was a roller wheel
that held up one end of the slide (heavier side with kitchen) was never supported right when the RV was built. Causing the slide to tilt 1" on one side. The factory stood by their statement that "Every RV that leaves our factory is 100% built and designed right
". Even the tech who fixed it at Camp World said this was a 100% build issue. A 5 year old could see what was going on. That is why I'll be very hard pressed to buy another Dutchman / Keystone product. Looking at Winnebago's, Arctic Fox, Bigfoot....