The line is underground. That doesn't mean you have to guess.
Under some of the most valuable ground in California run some of its oldest sewer lines. The cottage era homes of the Village and the coast carry lines that have served for the better part of a century, and when one develops a problem, the decisions get expensive fast. Which makes the discipline here simple and absolute. Nobody should approve a significant sewer repair, anywhere, but especially here, without seeing the problem first.
The inspection provides the seeing. A small camera travels the line from the cleanout to the street, live video of every foot, and the situation presents itself precisely. Roots at the joints, scale narrowing the run, a belly, a crack, an offset, or a line that's aged gracefully and needs nothing dramatic. Watch it live if you wish. The footage is saved regardless, and it becomes the foundation for every conversation that follows, with your contractor, your property manager, or the second opinion you're entitled to seek. Evidence is portable. Guesswork isn't.
If another company has already quoted you something substantial, bring their findings or let a fresh camera confirm them. Big underground decisions deserve a second read of the same evidence, and the evidence doesn't mind being checked. Ten minutes of video, total clarity, and every decision after it made by you, informed and unhurried.
"They didn't tell me to dig. They showed me the crack on a screen. Then I trusted the fix."