The answer to 'sewer repair won't flush' is that a clogged or damaged sewer line is the most common cause. Symptoms may include slow draining sinks, gurgling sounds, and sewage backup. Solutions can range from DIY unclogging to professional sewer line repair or replacement.
If the sewer line is clogged, you can try plunging or using a drain snake to clear the blockage. However, if the problem persists or you suspect a damaged sewer line, it's best to call a professional plumber. Sewer line repair often requires specialized equipment and expertise to properly diagnose and fix the issue.