Since the start 11 years ago there has been a problem with staining and rippling in our kitchens flooring. Just one area. It was repaired three times early on and lasted about seven years, then just before our ten years was up the builder had us replace it again. It has been tested for water and gas leaks to no avail. The last repair lasted only about 10 months. I want new flooring but can't proceed without discovering the culprit. Do you think I need to hire an engineer to come and diagnose the problem?