DSi top screen is discolored after blowing into the shoulder buttons

Hello,

I had my DSi for 2 ½ years and my shoulder buttons went broke a few months ago. A few days ago, I blew into the L and R buttons to make them work (I found that solution on Youtube) and they worked, but a couple minutes later the top screen's colors became discolored. Many things turned into a shade of pink. If I look at a picture of someone now, they look like they have blood all over them. Other colors became distorted too.

Can someone help me with this problem? I did find out that it was the moisture from my breath, but other than that, I couldn't find any answers. The warranty's expired, and I don't want to open up my DSi. Can you help? Thanks.