2007 Tahoe LTZ driver side seat power adjust stopped going backward half way, would move forward, and then stopped going back entirely. Took the seat out with the idea I would figure out how to manually reset the rails to fit my wife. I noticed the rail adjust screws were out of sync. Resetting and putting back in the car worked for a few times back and forth until it got stuck again. I noticed the track frame was warped, and the adjust screws were out of sync, again. Moving the rails I noticed one had some give/movement where the other did not. Looking closer at the mount the screw passes through I saw some of the plastic was broken. Presumably, some of the teeth inside are warn/broken, so the adjust screw was skipping allowing the rail to get out of sync causing the track assembly to warp, thus getting stuck. The temp fix, here, was just to remove the bad mount screw housing circled in the attached pic. This works fine on one adjust screw, but presume too heavy of a person might be too much load, eventually, but this solves the issue until I can find a replacement part. I don’t know what this part is called, and likely will have to buy an entire assembly to replace, or use for parts, but I figured this might help someone with similar issue.