Sounds like something is popping when extending the main slide. This only happens when the slideout begins to move. On a related issue, when replacing the carpet in the motorhome, I've noticed about a 1/4 inch gap in the reveal on the left side of the leading edge. The right side sits flush with the floor. Could this be related? If so, is leveling the slideout floor a DIY project? The Pace has Power Gear Slideouts.