The words "sewer line replacement" land heavy, especially in La Mesa's older neighborhoods where the lines have real age on them. This is what you're actually looking at. Old does not automatically mean failed. An old clay line can still be serving, and one with problems usually has specific, local problems, not total failure. The difference matters enormously, because the fixes range from modest to major, and which one you need is a question of evidence, not age.
The evidence comes from inspecting the line. What it finds shows where things stand. Roots at a couple of joints is one problem, and often a targeted one to fix. A cracked section under the front lawn is another, sometimes repairable as a section. A line compromised along its whole run is where replacement makes sense, and even then, lining the existing pipe sometimes does the job without turning the yard into a trench. The inspection shows which one fits yours.
After that, everything gets explained in plain English, every option with its tradeoffs, and the decision is entirely yours, made at your pace. A licensed contractor performs the work when you're ready. It starts with a look and a conversation.