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Hi there, I got latest iPad Pro 12.9 and hairline cracks started to appear without any visible impact No dents no bends - aluminum housing is like new It’s still under Apple warranty will Apple replace it for free?

It does sound like you got a defective screen. As they say nothing ventured, nothing gained! I would try to get it repair under warranty. If you just got it (one or two weeks from Apple directly or authorized reseller) you can call Apple and sign up for AppleCare+ which is a service contract the buys you the added protection.