You can check your V3 to tell if your polarity has been corrected. Just record a soundbite through the V3 onto your FR2LE. Download it into your software and then use the software to check if your polarity is aligned properly. You might need to check the FAQs to tell you how to do that. If you use Audition, PM me and I'll let you know how to do it. (FWIW, I just learned myself less than a month ago how to do it with Audition, after using Audition for the last ten years or so.)
this isn't entirely true, and it's not something that you can check on your own by running into your FR2LE (because the FR2LE doesn't have a digital input).
The thing with absolute polarity is, unless the two channels are 180 degrees out of phase
with each other, then you can't really tell. And because it's just about impossible to hear, that's why it slipped past Grace Design and they let it out of the factory with the issue.
What the problem actually is is that
both channels on the digital outputs had been reverse polarity relative to
both channels on the analog outputs (but on both the analog and digital outputs, the two channels were in phase
with each other). So if you're
only using the analog outputs, you have no problem. If you're
only using the digital outputs (and the polarity issue hasn't been fixed), then you
might want to invert both channels on your computer after the recording is made. (I say
might, because you won't really be able to tell the difference and it might not be worth your time. seriously, probably thousands of V3 recordings were made from the digital outputs before anyone noticed that the polarity was flipped relative to the analog outs).
all that said, just send a quick email to Grace Design with your serial number, and I'm sure that they'll be able to tell you whether or not the polarity on the digital outs has been fixed relative to the analog outs.