Septic pipe repair in Wolfeboro

[Lakepilot]

My in-laws live beside us in Wolfeboro. They have a pump up septic system i.e. the leach field is higher then the house. The line from the pump to the leach field has obviously broken as there is effluent coming out of the ground. This pipe has been repaired before, but it has failed again. Who would you recommend to dig down and fix the pipe. It's either going to need an excavator or a backhoe and someone that can test the field to make sure it isn't plugged.