antedeluvian - I guess that depends on how you did the upgrade. If you got your soldering iron out to do it, then you may or may not be able to put it back. Often this would be users who don't care all that much about the cal doing this sort of thing. If I didn't care about the precise cal or warranty I'd just measure a few test points and remember if it is a little high or a little low at high frequency and go from there.
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