Coronado has plenty of older sewer pipe, and the lines running from the houses out to the street are just as old. Many are original clay or cast iron, with a century of service and generations of tree roots. When one of them starts backing up, it could be a simple clearing or it could be a serious repair. Nobody can tell which from the surface.
That's what the inspection is. A small camera goes in through the cleanout, the capped pipe outside that opens into your sewer line, and makes its way out toward the street, sending back live video until it reaches the end or something in the pipe stops it. You watch it happen. You might see roots coming through the joints, grease, food and sludge packed along the wall, and scale, the mineral buildup that narrows a pipe, from decades of Coronado kitchens. It might be a low spot, a crack, a shifted section, or a line that's simply old and fine.
Once you've seen it, you're deciding with facts instead of somebody's opinion. What happens next is yours, on your own timeline.