Customer stated slight water stain is down into ceiling of kitchen. Found small water stain in ceiling of kitchen. Tested it with a moisture meter and found it was completely dry. The master bathroom is above the stain Tested the shower to find no leaks at all. With the moisture meter found high moisture around the shower and stains coming from the shower door to the wall outside of the shower, as well as large cracks in the grout of the tiled walls of the shower. Advised customer to get showers grout redone and the shower door resealed and then run the bathroom every night to see if the stain grown any. As of right now no plumbing issues were detected.