A few weeks back I started getting an alarm at the helm, checked the Smartcraft screen and it called out low pressure on my port sea water pump. Changed out the sensor and two weeks later I'm getting the same alarm. I checked the pump pressure on the screen and it reads 37.5 PSI at Idle and 45 PSI at 2K RPM same as the starboard engine. I alsoreplaced the raw water pump back in July so the pump and impeller are fresh, any thoughts?