I have a 2008 Crescendo FRED 32 ft and the same thing happened to the bedroom slide on ours. What I found was the sheer pin on the motor had sheered off. There was nothing available in Safford, AZ so I went to the Cat dealer and they sold me a couple of Spring sheer pins that they said was the toughest on the market. Well, both of them have sheered off so, not so tough, I guess. I have now put in a 1” long Titanium pin and have had no more problems. If your slide is like mine, it is not an easy repair but this 80+ year old have done it 3 times now. Mine was made by Power Gear (now Lippert).