I had a potential customer approach me about a lawn that browns out very quickly at the slightest sign of heat, weeks before any others do. After walking through the lawn, it has a lot of bare spots. Most of the lawn is in constant sun. My first thought is poor soil. In some of the bare spots or where the grass is spotty, there is small patches of dark brown moss growing. My thought is to core aerate the lawn and then put down some type of lime product. What do you experts think or suggest?