[ojays lawn care]

I had a new customer ask me the best way to repair a lawn after a hot summer, with lack of watering. the lawn has nice full green areas, and spots of total death. I am assuming its due to the completely dry summer we have had, but it could also be grubs, altho customer said he used grub control. There is quite a bit of dead spots so I recommended a complete lawn thatching, Aerating, and overseeding. What do you guys think? This is a little out of my comfort zone, and i don't want to waste my time, and the customers money.