Upon arrival customer stated they were having a backup occurring in the home. I found there was a condensation line stubbed in the main sewer line. I informed the customer that we would have to pull a toilet and run the camera and sewer machine. Gave customer estimate customer approved the estimate. I cleared the blockage and ran the camera. When running the camera found a belly in the main sewer line outside of the home. I located the line and found it was under the front porch. I informed the customer on what was happening. Gave customer estimate to do a spot repair. Customer approved estimate. We had to tunnel under the porch. When we got the pipe exposed we found that all the 45s were installed improperly which was causing the belly. We cut out the section that had a belly and repaired it. Tested system and system is working properly with no leaks or issues. Then we backfilled the hole. Also told customer it could backup again due to the rest of the existing sewer line.