The pressurized system is made by Hynautic. The company was purchased by Sea Star some years ago and the system is still supported. There is a third system that is found on boats made by Wagner, not many of those around.
All the previous comments are correct. If a leak was mentioned, you should only have to fill her up, if Hynautic then pressurize. Of course someday you will need to address the leak.
If you have a 2 station boat with a Sea Star system ONLY fill it at the upper station. As a vented system the lower station has a non vented plug and if you pop the lower station all the fluid in the system uphill will drain out, not pretty.
Sea Star Helm -- Hynautic Helm -- Hynautic Reservoir