Call around and get some prices for a camera inspection. Some, not all have small cameras that will get to the break location. If they can see the break, they can then locate the camera head by electronic signal. Then you can decide if you want to go into the slab and repair or go the pump route. The age of the pipe might sway you towards a pump or perhaps a new underslab line replacement. Personally, I prefer gravity flow over a pump any day. Call your insurance as well. May be of no help but what can it hurt?