Find the controller and see if you are getting an error code. Call Forest River and tell them the issue, they might be able to talk you through it. A Thor representative recently told us how to get a slide back in, but I've heard others that they didn't think it would work.
We had an issue recently with one of our slides where it stopped going out part way and would not retract in. Ended up having to call a RV mobile tech to get back in. Extended warranty is covering to replace the motor, but got a message the other day that they (dealership) was having trouble getting the slide to go in and think the mobile tech might of stripped something. Still waiting to hear what is going on with it.
Brian
2013 Thor Chateau 31L