Greetings all, I am a yacht broker representing a buyer in the purchase of a single engine sedan powered with a 2009 vintage 380-hp Yanmar 6LY3-UTP. The engine has 1700 hours on it. Her (original) owner has performed all of his own maintenance. The engineroom is clean as a pin and the mechanicals all look really good. My impression is that the service has been mostly oil changes and periodic water pump impellors and such basics. I asked the owner if the aftercooler had been apart and cleaned/serviced or flushed. It has not. As I read on the net, it would seem that valves should have neen adjusted by now as well. The owner is a capable guy and he has a detailed log since day one. I believe that he has done a good job with what he has done. What else should we be looking out for (besides a Yanmar certified mechanic) prior to survey? Any tips or experience with this particular model and HP Yanmar that I can gather in advance would be greatly appreciated.