Ejector Pump Broken

Our ejector pump stopped working. Since the lid to the pit also corroded away some time ago we are wondering if we should replace the pump and the pit/container Putting in a new container would involve breaking the old one out of the concrete. There are some other things we should probably do as well such as battery backup, alarm, and a check valve. Any recommendations for plumbers who do this kind of stuff? If you have had this kind of work done, how much did it cost? Any feedback would be much appreciated.