You might be surprised how little if might have cost to fix the pipe under the slab. I know it would be more than 1100 but it can be done very efficiently. I have done it.
First, a leak locating company comes in and positons the leak within a couple of feet. Then the plumber just opens the slab in that area, fixes the pipe and puts in new concrete. It does not mean ripping up the whole floor or even a large portion of it.
Leak detection is pretty impressive. I also had it done for an underground water leak at my business. Pinpoints the location of the needed repair and minimizes the work required.