I have a brand new hustler mower with FR730V. Mower has 2 hours on it and makes a dinging sound like a cow bell coming from near the muffler right after I shut the mower off. It goes on for a minute or so and then dies off. I have never heard this on any other mower and there is not a lot to be found searching online. Attached is a video that starts about 20 seconds after the engine is shut off. I'm just trying to see if anyone has an idea of what the noise is before I go back to the dealer. Thanks in advance.