Re: livewell not draining
You should be able to fish (no pun intended) something thru starting in the livewell. You may also want to try to get garden hose inside the livewell and open it up full. If you do need to fish something thru, make sure you don't have any sharp edges as you don't want to put a hole in the drain line. You can also check where it exits the boat at the transom to see if you see anything blocking it. It is just gravity drain so it wouldn't take much to slow it down or stop it completely.
My boat was the same way when I got it and all it took was a garden hose with a good high pressure nozzle.
Good luck and Crestliners are great boats!!!