My iPhone 5's power button has almost completely gone dead. It does not work unless you press it really hard in a certain spot. I bought it from the Apple Online store back in September. I'm in Australia. Just have two questions: 1) Can I print out my invoice (which has been emailed) and bring the phone to an Apple store for repair because it is under warranty? 2) How long will the repair take? Or will I get a new phone? Thank you.