KK board pairs, getting called down...check/Call river?

[halperin]

40/10/2

Full Tilt No-Limit Hold'em, $2 BB (5 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($197)
SB ($198)
BB ($389.50)
Hero ($203)
MP ($304.95)

Preflop: Hero is UTG with K, K.
Hero raises to $7</font>, 1 fold</font>, Button calls $7,2 folds</font>.

Flop: ($17) T, 5, 7 (2 players)</font>
]Hero bets $14</font>, Button calls $14.

Turn: ($45) 5 (2 players)</font>
]Hero bets $38</font>, Button calls $38.

River: ($121) T (2 players)</font>
Hero checks, Button bets $88</font>, Hero