It would be a big suprise to find any serious issues with the boat after only a few years. If the engines been run "more than usual?", that might not be a bad thing either. Diesel engines like to be run. Keeps the "juices flowing".
Ask the broker what kind of cruising the previous owners did. If they took her up and down the ICW that might explain alot of those engine hours.
Is the boat Maleva?
Excellent boat by the way.