My plumber found a slab leak under the concrete floor in our guest bath room/bedroom area. There was a pinhole in the copper pipe. The pipe has a red tint to it in the area of the pinhole. The plumber says maybe it is from electrolysis. Maybe there is an electrical current or ground problem. There are several people in our neighborhood of about 50 homes that have had slab leaks in the past 5 years or so. This is our 4th leak in 4 years. We are in Ft Worth, TX and have clay soil. Also my brass fittings corrode. The chrome fittings do not. If someone wants a photo of the piece of pipe with the pinhole let me know & I'll post one. I'm not happy waiting for leak #5. What should we do?