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those lines appear without tilting the camera, I guess its the time for repair (I hope the warranty is covering this)Is it "under the view finder" if so then it may be the reflection of the alignment lines in the sensor,.
I'm a beginner so i'm don't understand those things so much but I think the mirror is OK it lifts up nice and I forgot to mention that when I look in the viewfinder I see under the viewfinder screen two objects who looks like this / \