I want to take my iPhone for replacement?

My dad is taking me to Att store to replace it because it had had problems with microphone and activation. I sent it to Apple to see what it wrong and they said the Liquid Water damage indicators were triggered. It was only the internal ones, not the SIM card LCI. If my dad goes to att store and asks for a replacement, will they open my phone to see it?

P.S. I have the iPhone 5s

Please ANSWER FAST I'm ABOUT TO GO TO THE ATT STORE

Yes it is the first thing they check for is user damage. Usually it isn't covered.