I'm late to the party,as usual, but whoever bought this BUSS got a helluva deal.
It has an EMI/RFI brick that is much larger than a normal RevB. It is as big as I could cram into that size enclosure. It also has additional HF filtering dedicated to isolating digital nasties. Also, all of the parts were cryoed, broken in and then cryoed again.
Special sauce indeed.
Ya dun gud!
Dave