We had an Iphone with this same issue and Apple said they could do nothing about it. Our phone was working when we mailed it to them , yet we had to pay for the new one they sent in the meantime. I’m interested in seeing how this turns out
A class action lawsuit against Apple is alleging that the company relies on a faulty technology in its iPhones and iPods to determine whether a device has been exposed to liquid and can be repaired under warranty
via iPhone Atlas: Apple iPhone tips, how-tos, troubleshooting, and news – CNET Reviews.