The fresh water pump on my 1981 Hunter 27 has quit. It's a Shurflo model 220-223-34. I took it apart but have no clue where the problem is. I suspect the motor is shot. We seldom use the pump so I don't want to spend the money for a new pump (can't find Shurflo anymore) but would like to find a rebuilt or get it rebuilt. Any idea where I'd find a place to buy a rebuilt?