The tree that shades your La Mesa street often has a root system wider than its canopy, and its roots go looking for moisture. An older clay sewer line, some still in the ground for decades, has joints every few feet, and years of settling have opened seams in plenty of them. When a root finds an open seam, it grows inside, a thin root at first and a mat later, until it catches enough to stop the line.
If this has already happened to you more than once, there's a reason. Clearing roots without sealing their entrance only lasts so long. The roots return through the same opening, on roughly the same schedule, and the visits keep coming. Stopping that means finding where the roots are getting in. The camera helps answer it, showing the joint or the crack, and whether it's one entry point or several. Once you know that, the problem can actually be fixed.
The fix, once the entry is known, gets matched to what's actually there, sealing a joint, addressing a section, whatever the footage justifies and nothing more. All of it is explained plainly, the decision is yours, and the work is performed by or under a licensed contractor when you're ready.