I changed my pump last fall. It's just one big radial feed system, each exit point should be independent off the main feed. The pump can be accessed by removing the tackle draw enclosure under the rigging station sink. Plumbing is straightforward (wasn't too impressed to be honest) but a lot of Ts and connection points. I'm guessing an obstructed or kinked line. There isn't a much of a tie down system either. If a clog look an the connection points. Barbed fittings are used which will restrict ID of the system at these points, that coupled with the barbed end is a good place for things to collect, build up and cause a blockage.