TD hand couple of close call.

[Seb86]

PokerStars Game #12641878000: Triple Draw 2-7 Lowball Limit ($3/$6) - 2007/10/15 - 13:03:24 (ET)
Table 'Wilhelmina' 6-max Seat #5 is the button
Seat 2: Seb86 ($219 in chips)
Seat 3: dvice1 ($105 in chips)
Seat 4: jcdgoad ($134 in chips)
Seat 5: danx7 ($116 in chips)
Seat 6: benbo ($107 in chips)
benbo: posts small blind $1
Seb86: posts big blind $3
*** DEALING HANDS ***
Dealt to Seb86 [3d 2h As 2d 3s]
dvice1: folds
jcdgoad: folds
danx7: raises $3 to $6
benbo: folds
Seb86: calls $3
*** FIRST DRAW ***
Seb86: discards 3 cards [As 2d 3s]
Dealt to Seb86 [3d 2h] [9d 4c 7d]
danx7: discards 2 cards
Seb86: bets $3
danx7: calls $3
*** SECOND DRAW ***
Seb86: stands pat on [3d 2h 9d 4c 7d]
danx7: discards 1 card
Seb86: bets $6
danx7: calls $6
*** THIRD DRAW ***
Seb86: stands pat on [3d 2h 9d 4c 7d]
danx7: discards 1 card
Seb86: checks
danx7: checks
*** SHOW DOWN ***
Seb86: shows [3d 2h 9d 4c 7d] (Lo: 9,7,4,3,2)
danx7: mucks hand
Seb86 collected $30 from pot
*** SUMMARY ***
Total pot $31 | Rake $1
Seat 2: Seb86 (big blind) showed [3d 2h 9d 4c 7d] and won ($30) with Lo: 9,7,4,3,2
Seat 3: dvice1 folded before the Draw (didn't bet)
Seat 4: jcdgoad folded before the Draw (didn't bet)
Seat 5: danx7 (button) mucked [4d 8s Qc 5s 2s]
Seat 6: benbo (small blind) folded before the Draw

I would like to have your though on this one as I had (what I believe is at least) a decision to make on about each street.

Pre draw is that a must call ? I liked that I had 2233 and not only 23, leaned me to a call.

Obviously I hit very nice but should I keep the 9 ? he drew 2 and didnt raise so I assumed he didnt improved and thus kept. Was it a must kept if he drew 1 or / and raised ?

After second draw its quite straight forward, I break if he raises (maybe I shouldnt ?).

Should I value bet the river ? as I drew 3 and PAT my hand may seem like a T9875 or something (or even a snowball, I just caugh snowballing a few hands ago by another guy). I still dont think its + ev though.

I had no read on vilain.

I would appreciate if anyone would try to answer point by point as I believe this hand includes some "though" decisions (including what do I do if I get raise after the second draw).