2011 Mercury Pro XS 1b825207. I bought this boat used test drive it ran great. Took it to a certified mechanic who did a once over and after purchase immediately did yearly maintenance and said everything he could see looked pretty good. Today was the 4th trip I've taken in it and after the first short run this morning it started developing a squeeling chirping sound that progressed to the point where I got off the water out of fear of significant damage. So frustrating as the last thing you want to do when you buy a boat is put more unexpected money in it. Made sure the coolant temp was 120+ before take off. Any of you guys heard a sound like this from your motor before? Guess I'll send it in to get looked at tomorrow.
Edit spoiler alert: the compressor failed. With a tota cost of approximately 4500 dollars and total down time of a little over two months.