i am working on a mid to late 2000,s Mercruiser 8cyl generation two power steering issue. water in the power steering fluid. Changed the oil cooler. Power steering pump had numerous leaks, replaced it. changed the steering cable and steering cable tube. started the boat after the winter, the steering wheel turns to port on it,s own and i can not turn it back ,unless i shut down the engine.........bad pump ? bad actuator ? please help