I don't want to get charged for a replacement.
I don't believe so.
However, I was sending a phone back once, and, while on the phone with the CSR, they were like, just so you know, if we find out this isn't a warranty issue, you will be charged this amount of money. As that is unacceptable to me, I asked how we could make it so that wouldn't happen. They told me to go into a Verizon store (one that can initiate an exchange), and, have them confirm that it was a warranty issue and that I wouldn't be charged. She made notes in the account so they could see all that we had been through on the phone, I went in, they checked a couple of things, and said, no, it's warranty, you wont be charged. And, that was that.
During that same interaction, the guy asked me if I had rooted, I said no. I then asked him, if I was, would he be able to know. He said, most likely not. The guy appeared to be being candid with me, but, ya never know.