As prev stated, probably Schwintek (Lippert) slide. If the closet walls on the outside have channels top and bottom with cut gears, it is a Schwintek.
Schwintek-In-Wall slideout doesn't have manual override, only way is to remove motors to move slide. BUT, there are some procedures to try. Here is a link to the manual, with info on resetting the control unit you can try. Need to know where the control unit is in your trailer!!
https://lci-support-doc.s3.amazonaws.com/manuals/slideouts/ccd_0001602.pdf
One thing you might try quickly is to hold the switch till the motors stop when retracting. You'll hear them hit the amp limit. Supposed to resynch the motors. You should do same anytime slide is run in our out. Hold switch for a bit after the slide opens and stops and same when closing. May not be the solution, but simple try. If not, you'll need to spend time in the manual!!!