Cut Sheetrock ceiling to diagnose leak from up above. Customer stated that there was a leak coming from master bath shower and that shower pan was flexing. Recommended to customer to cut sheet rock from below and test shower. Customer agreed so I went ahead and cut small hole and ceiling in kitchen and ran water. Didn’t notice any water leaking until customer was in shower stepping on the spots that were flexing and then noticed drain moving causing a leak. Also that the subfloor was flexing. Recommended customer to reliable restoration to see if it’s something that they can take care of as far as the subfloor. Cleaned up work area. Chen plumbing is not responsible for sheet rock repair.