Fold AA?? Ultimate bet TV Tourney

[LLKOOLK1]

60 players remaining blinds 50-100
3 limps(UTG,+1,+2)
I have AA in co seatwith 2325 chips.I raise to 225.
BB calls, others fold.
I just got moved and know nothing about the player in BB.
Flop 6 [img]/images/graemlins/diamond.gif[/img]6 [img]/images/graemlins/club.gif[/img]2 [img]/images/graemlins/diamond.gif[/img]
BB checks. I bet 400, BB check raises to 1200.
Whats your play?
_$LL$