I have a 2012 Stingray with a 3.0 Volvo Penta that has been beeping and going into limp mode. I took it into the marina and they changed the impeller, temperature sensor, engine thermostat, 2 exhaust thermostats, checked the water flow, and it's good, recirculated the pump, and it's still beeping and going into limp mode. The code reads that the exhaust manifold is running hot (198). The mechanic isn't familiar with Volvo Pentas and is unsure what to do next. Any advice would be greatly appreciated.