At the end of last season, I had a problem with my cockpit freezer not cooling on the Post which is cooled by a Cruisair KRA025 Condensing Unit. The AC pump is brand new, all of the raw water lines have been cleaned, and the raw water supply pressure was verified. As I dug into troubleshooting it, I was thinking it might be the Constant Pressure Valve (CPV) however since this is pretty tough to get to, I wanted to check some other possibilities first. The sightglass for the condensing unit (see attached picture) is clear and the colored media is yellow which from the manual indicates moisture in the system and possible lack of coolant. This is my first time troubleshooting this unit and I was wondering if I am reading this correctly. Anyone have this issue before? Should I try to add coolant first or does this appear to be a moisture contamination issue?