Should I open up my Iphone 6? (fix water damage)?

I got pool water in my iPhone 6. Not a lot, but not just a little. I had a life proof case but i didn't register within he first 2 weeks of purchase… The phone was on, and the screen went blue and shut off. There was a slight buzzing noise, or maybe it vibrating slightly whenever i hit the power button, but i stopped doing that. I have the right screwdriver to open it, and with research i think that my motherboard is not fried and all i have to do is remove the water from the inside and replace the screen, but my mom wants me to take it to a store and get it fixed there, but i'm afraid they're going to lie about having a fried motherboard and make us pay more than what i have to. What do you think? If i take it apart at home will and put it back together, will the at&t store still fix it?

Put the oven on very low and put it inside… Very low…

No! Take it to the store.

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