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I work at a dealer and although I havent had one car come to us yet for this, I've briefly read the info on what's involved.
It has nothing to do with replacing the elements whatsoever so if you need new elements, they won't be replaced for free.
What's done is another wiring harness is added under each seat and included in that harness is yet another built-in relay which is dependant on ambient temperature. It's just a simple add-on safety device plugged in to help reduce current flow so that the elements can't get too hot so I can understand why the heat might be less than what you had before.
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