Dealer called me today and said the problem was corroded wires in the radio assembly...that and possibly something in the ignition was combining to drain the battery to nothing. They're going to consult with BRP and have ordered new parts for the assembly. Hoping to have it back by sometime next week.
The REALLY great thing was they gave me a loaner (2011 RT S in the same color as my RT AC) so I'll have something to ryde in the meantime. VERY happy about that...I'm going to cruise by Biketoberfest tomorrow.
Central Florida Powersports is bending over backwards to keep me going!
I'm also buying a battery tender...