Tough spot on the river with TP

[Bruut99]

Villain is 30/20/2 over 743 hands. The hand before he called my quads Aces down with lowpair for a 40$ pot. Im not scared of MP. What to do here?

Convertor seems to be screwing up this HH, so here it is:

FullTiltPoker Game #4127852903: Table Sue (6 max) - $0.50/$1 - Pot Limit Hold'em - 7:57:09 ET - 2007/11/10
Seat 1: Awful Fish ($125.55)
Seat 2: kenyonbrook ($49.65)
Seat 3: utilities ($216.90)
Seat 4: Muntuna ($65.75)
Seat 5: Sjing Sjong ($111.30)
Seat 6: jonstephens21 ($229)
utilities posts the small blind of $0.50
Muntuna posts the big blind of $1
The button is in seat #2
*** HOLE CARDS ***
Dealt to Sjing Sjong [Jd Qs]
Sjing Sjong raises to $3.50
jonstephens21 calls $3.50
Awful Fish calls $3.50
kenyonbrook folds
utilities folds
Muntuna calls $2.50
*** FLOP *** [6c Js 9d]
Muntuna checks
Sjing Sjong bets $8
jonstephens21 calls $8
Awful Fish calls $8
Muntuna folds
*** TURN *** [6c Js 9d] [5c]
Sjing Sjong bets $17
jonstephens21 calls $17
Awful Fish calls $17
*** RIVER *** [6c Js 9d 5c] [7s]
Sjing Sjong checks
jonstephens21 checks
Awful Fish bets $51
Sjing Sjong has 15 seconds left to act
Sjing Sjong has requested TIME