Not really a re-gas, they extract the gas currently in the system and put it back afterwards because it'll still work - they'll top up the system if necessary afterwards, of course.
It's not legal to just release the gas, it hasn't been since the 1990 EPA came into effect; waste refrigerants go for processing and are either recovered (if they're still viable) or incinerated because they're quite bad for the old Ozone layer.
However... They categorically told me it would be a re-gas, because there has been problems and that's the reason they need it longer. But it's also everything else that's now gone into the parts bin.
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