I just got a beautiful used new to me boat. I was just doing some minor inspections on it. Replacing the impeller even though it looked new, and thermostat. I pulled the risers off and took some pictures. The boat is from cali but not sure if it ever saw any saltwater. Also I found some old impeller material in thermostat housing. So my concerns are what else should I do to make sure no impeller material is stuck anywhere. Also do these look good or do they need replaced. Penta 5.0 gxi