it's the motor???
We had an SL on our boat that sort of quit working. It would drop the anchor, but stalled out when I tried to bring it up. It turned out to be a bearing!!!! The model I had used a "one-way roller bearing". VERY POOR DESIGN!
You can read about it on our position reports web page at: http://www.svguenevere.com/2006/gear/gear2.html
Greg