Hi... took out my new 2019 Tracker Grizzly yesterday for the first time.. fairly new to boats.. pull it out of the water, pull the drain plug and a few gallons worth of water came out... didn't take on any water during the short run I did.  Leak?  Something I may have missed to seal or close before I went out.

Does it have a livewell? Could be loose plumbing

As mentioned, loose hose clamp on live well, or bilge pump is not uncommon.

What you can do, while it's on the trailer, put the drain plug in and fill it with a few inches of water and see if you see any coming out anywhere around the hull. 

Just don't put too much water or you can overload the trailer.

If you have an onboard charger, make sure it's mounted higher than the water level you add.  They are supposed to be water proof, but that's not always the case.  Sometimes it more like water resistant and they can leak when totally submerged.

If you had the drain plug in then it's not your fault.  I would bet it the plumbing but it's the dealers problem to solve.  New boats should not leak. 

Thanks for the suggestions.  Will report back with the issues.  

oh.... I amost forgot.  Welcome to the forum.

Hello and welcome to the forum. If the boat is new and under warranty I would definitely take it to the dealer to be repaired.

Having the dealer take care of the problem is definitely the way to go.  However, sometimes if it's a simple fix like tightening a hose clamp that's easy to get to is a much more practical solution.  The dealer could be many miles away, then you have to make two trips, one to drop it off, another to go back and pick it up, and then you are without the boat during the time it's at the dealers.  Also, if it's a leak, and you do need to take it to the dealer for repair, you will know what it is and where so you can piece of mind knowing what it is, and can inspect the area to ensure the dealer did a proper repair job.

Is it possible that you took in water over the stern by shutting down too quickly?  I've had a couple of boats that would do that if I pulled up too abruptly.