this is a 2006 utopia with twin rotax engines. above 6000 rpm the left engine loses rpms, then the buzzer goes off, and the overheat light comes on. i shut down the engine, wait a few minutes, start it up, and it comes on only to do the same thing. at lower rpms, the buzzer comes on after a longer period of running it. The mechanic looked at it, said it was a low oil pressure problem, said it was ok, and when i picked up the boat it did the same thing. it was as if they never fixed anything. the service dept seems stumped.