Mine has a single motor running a shaft with a gear on each end.
You pull run the slide about 1/2 way out to get pressure off of the gears , open the basement door, pull the rear cotter pin from the rear gear, and slide the gear forward to disengage it from the rack gear on the inner tube.
Then measure front and back distances from outside wall and edge of slide, move the rear of the slide by pushing or pulling it to get the measurement equal. Then just push the gear back in and reinstall cotter pin. I had my wife bump the button until the cotter pin faced down to make it easy to pull it out.
Don’t disengage the motor brake or the whole slide will move and you just want to move the rear.
My front skipped due to a piece of some sort of fiber piece wore out which is a anti jump deal. I will attach a pic of the aluminum piece I had made. It keeps the rail in the channel to keep the gear from being able jump teeth.
You can’t really tell in the pic but, the aluminum plate is wider than the opening in the bottom of the channel to keep the rail from being able to tilt below the channel.
That area gets a lot of water thrown on it in rain so I will also be replacing the 2 rollers on each side of the gear and painting with chassis saver whenever we go home just in case they are not running smoothly.