We had a SeaRay 480 with the hydraulic platform from General Hydraulic Solutions (GHS), who built most if not all of the platforms for SeaRay. Ours was a 2004 model, and we eventually replaced all parts except for the platform itself. When it ran, it...
Living in Florida and in a marina with a lot of 'funk' in the water, I've become a lot more knowledgeable with our A/Cs than I ever intended. Based on what you've done so far, it sounds like you need a professional to find the line blockage - may nee...