[Newbeginnings]

We had a bad area between our lawns, the neighbors lawn and ours. We did all the troubleshooting as you have too mentioned. My husband suspected it could be irrigation running from the neighbors draining lawn into ours. We called Jim Baumgarten (irrigation expert) to look it over he asked if he could see our neighbors irrigation settings because our neighbors lawn had fungus. Turns out neighbors irrigation was going on at midnight almost every night for 30 minutes on each zone, (he did not realize it) and because of the grade of his lawn sloping into ours the water was running down into our lawn soaking the area and causing the dead grass. Jim adjusted neighbors irrigation and the problem was solved. We had to rip out all the sod and replace with new, and warranty did install a french drain, but this was before my husband and Jim determined something else was causing the issue, we also drained our pool and had it leak checked, we went thru some expense before we found the problem. The French drain warranty installed was after our 1 year closing, house was about 2 years old when they put it in, we went through all the steps with warranty but they did finally authorize the install. Everyone was pointing fingers at each other. We even chopped up our curbing border on that side of the lawn because the lawn service said that was blocking the drainage. Very frustrating. Good luck and keep on it.