I have a 2004 PD, and I did extensive research on this issue - indeed, my VIN is/was within the range of VINs in the recall. However, when I called the dealer & VWUSA, both said there are no recalls for my car.
The key nuance - there are no CURRENT recalls for my car because the recalls ended. ie - VW only had to complete the repairs on faulty tandem pumps for a 5 year period - which ended a few years ago. If you didn't get the repair done within that 5-year timeframe, you still may have a faulty tandem pump, but VW won't pay to fix it.
And, yes, the recall issue was due to a leak at the cover - on LUK tandem pumps. I have a LUK tandem, and it leaks at the cover. Go figure.
There is a rebuild kit available in Europe, for roughly $70, but they generally won't ship to the U.S. All that is really needed is a $5 gasket. But, in the US, we are stuck paying $300 for a whole-new tandem.
As much as I hate leaks, I just let it leak, for now. It isn't gushing out, or I would take more drastic measures.