If nothing inside the home was altered you should not be getting a smell. Personally I'm confused as to why the repair person would have left the original line there and ran another one through a new hole. I would have pulled the old line up, ran the new line (in PVC) and used the same hole in the septic tank instead of creating a new one. Did he seal up the hole in the tank from the old line?
Plumbers in Chandler are aplenty. You can find quite a few people willing to do the job. However, most of these people are not true experts. Many of them join the work only a few months before. Others do not have a proper skill-set. You cannot rely on such plumbers to provide a long-lasting service. When it comes to leakages, you can never take a chance. Many times, walls need to be taken down to repair the leakage. If it comes back again, you have to repeat the ordeal again. But when you hire Chandler Plumber, you skip all these issues at once.
Sometimes you might need your sewer and drain lines inspected. For instance, if your sewage is backed up, then you probably want to determine what the cause is. In instances where we can't physically get to the problem to see what it is, we can use a sewer video camera to go down into your lines and take a video showing us what's the issue then. That way we'll know the appropriate way to deal with it.