Water damaged Apple Watch--is screen still good?

I have an Apple Watch Series 2. About a year ago I accidentally cracked my screen, so I replaced the screen with one I bought from ebay. Everything was working great till last weekend when I went swimming and forgot to take off the watch.

The screen went blank and the watch was totally unresponsive. I took the watch apart and noticed a little condensation on the inside. I tried to dry it out and put the screen back on but nothing happened.

I was thinking about buying another Series 2 watch with a cracked screen, and attempting to put my old screen on that watch.

Do you think the water damaged the screen, or just the internals of the watch? Is there a way to test the screen to see if it still works? The screen shows no signs of water intrusion.