The motors might need to be resynched, but that would be a long shot, based on the blinking lights.
Try bringing the slide all the way in, and hold the slide button for an extra few seconds after the slide is fully retracted. Then try putting it out again, holding the button for a few extra seconds after the slide (fully?) extends. Do this procedure 2 more times and the motors should be synched.
If that doesn't work, here are some other troubleshooting ideas from LCI Lippert.
https://lci-support-doc.s3.amazonaws...cd_0002078.pdf