I too thought about modifying the buzzer, i've done similar mods with loud buzzers by screwing a screw right into the hole most of them have. That puts some pressure on the buzzing part reducing the noise substantially.
In this case, the only way to do anything with the buzzer is to remove the whole board like Brian's Youtube video shows. It's buried in such a way that you can't even get to the leads on the top without going 99% of the way.
In this case, the only way to do anything with the buzzer is to remove the whole board like Brian's Youtube video shows. It's buried in such a way that you can't even get to the leads on the top without going 99% of the way.