The answer to 'sewer repair not working' is that there are several common causes, including a blocked or collapsed sewer line, tree root intrusion, improper repairs, or ongoing issues with the original sewer system. Symptoms may include slow draining sinks, gurgling sounds, and sewage backups.
To troubleshoot, it's best to start by using a sewer inspection camera to identify the exact location and cause of the problem. This will help determine if it's a DIY fix or requires professional plumbing services. Simple clogs may be cleared with a plunger or auger, but more complex issues like cracked pipes or tree root damage usually need the expertise of a licensed plumber.