Wow 41 views on this and no response. Well all I can contribute is that we know it is either 6 (Romeo plant built) or 8 (Windsor plan built), so if the 3v is primarily produced at the the Romeo plant I would venture to guess it has 6 mains - 2+2 and 2 jacks.
I would think contacting ARP would get you a 100% accurate answer. lol