Under the slide on the roof of the exterior storage compartment should be a shaft with a nut. That is the manual retraction.
Could be a couple of different things
1. the cog that sits on a shaft and turns (bring the slide in and out) is on their with set screws. If it got loose, it could have slid over. If you pull the front fascia on the slide floor you should be able to see in there to see if that cog lines up with the teeth in the slide ram. That would be an easy fix...if you have a long tool to slide over the cog and tighten the set screw,
2. sheer pin on the motor broke. That requires pulling the motor. 6-8 hours I'd guess to repair which includes pulling the slide room.
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