[lakershaker]

It is the raw water pump which pulls lake water in for cooling. Supposedly, mechanic said when doing the work to replace impeller, the pump fell apart from wear. Boat has about 250 hrs on it, with the original water pump.

Thanks for all the info. Unfortunately, I am too far away from the lake in the winter to be able to check it myself, and need to trust that they are being honest about it. But man, it is expensive!