I've actually no idea at all what that particular piece does.
However, if you base things on what you would do it it was a gas oven - would you say "it's only leaking a bit of gas" ? - then I think you are on the right lines. Just because microwave radiation is invisible, doesn't smell or seem to polute, that doesn't mean it is harmless, and it is obviously better to err on the side of caution.
If it was something a little more powerful, such as gamma radiation, I'd say keep using it - giving your kids two heads just has to be beneficial.
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