Once out of warranty, we had also had it serviced by someone from our insurance company while we rented it out for a few years and again by a plumber when we moved back in. The last plumber told us it wasn't a plumbing issue, but recaulked the shower enclosure for good measure. When Mike got here with his plumber he thoroughly investigated every possible water source in the wall at the pipes and finally determined that the drain had never been sealed properly in the first place causing water to leak into the foundation and then pool in the wall. He also scraped out all the old decayed grout/caulking and resealed it with mildew resistant silicone caulking. He was quick and efficient in investigating the source, solving the problem, putting everything back together, and cleaning up. A project I thought might take a week, was done in a day. Not only was he thorough, but I homeschool my four kids so his presence in our home was obviously an exciting, though expected slight distraction to our school day. Mike was great about letting the kids watch and explaining all the things he was doing to them during the process and explaining how stuff like math was important to what he does.