$200 NL: AA, line check on low card flop

[Chipchucker5]

I had just sat down recently, but villain had been in a few pots, nothing too out of line though. Concerned about the turn check and the river call. But comments on all streets would be appreciated.

PokerStars No-Limit Hold'em, $2 BB (6 handed) Hand History converter Courtesy of PokerZion.com

UTG ($126.80)
Hero ($230.15)
CO ($210)
Button ($117)
SB ($539.60)
BB ($192)

Preflop: Hero is MP with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $6</font>, CO calls $6, Button calls $6, <font color="#666666">2 folds</font>.

Flop: ($21) 7[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $16</font>, CO calls $16, Button folds.

Turn: ($53) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, CO checks.

River: ($53) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets $45</font>, Hero calls $45.

Final Pot: $143

[Chaos_ult]

what's your reason for checking the turn?

I bet for value/protection

[Chipchucker5]

[ QUOTE ]
what's your reason for checking the turn?

I bet for value/protection

[/ QUOTE ]

Pot control I guess?? I thought there was a decent chance he had a set. Should I be bet/folding the turn or happy to get it in?