Did I overplay AA?

[ChrisCo]

I was playing a 30+3 party MTT that started with 1300+ players and we were down to about 275 left with the money starting at 130th. I had t12000, while average was below t5000. I had a very solid table image, only showing down big pairs so far. I was also going against the chipleader of the tournament, so he was the only one at my table that could take me out.

Party Poker No-Limit Hold'em Tourney, Big Blind is t300 (10 handed)

Hero (t11884)
Button (t5750)
SB (t4390)
BB (t1510)
UTG (t16840)
UTG+1 (t9116)
UTG+2 (t287)
MP1 (t2977)
MP2 (t5120)
MP3 (t2909)

Preflop: Hero is CO with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img].
UTG calls t300, UTG+1 folds, UTG+2 folds, MP1 folds, MP2 folds, MP3 folds, <font color="CC3333">Hero raises to t900</font>, Button folds, SB folds, BB folds, UTG calls t600.

Flop: (t2250) 2[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="blue">(2 players)</font>
UTG checks, <font color="CC3333">Hero bets t1500</font>, UTG calls t1500.

Turn: (t5250) 2[img]/images/graemlins/club.gif[/img] <font color="blue">(2 players)</font>
UTG checks, <font color="CC3333">Hero bets t3100</font>, UTG calls t3100.

River: (t11450) 7[img]/images/graemlins/spade.gif[/img] <font color="blue">(2 players)</font>
UTG checks, <font color="CC3333">Hero bets t6384 (All-In)</font>, UTG calls t6384.

Final Pot: t24218

Results in white below: <font color="white">
UTG shows 2s 2h (four of a kind, twos).
Hero shows Ad As (two pair, aces and twos).
Outcome: UTG wins t24218. </font>

Is a check behind on the river a good move?