Definitely cannot be repaired... Being as that goes across the tread completely, without a better inspection, I would say it is a defect. In fact, almost 100% sure, but again, without seeing it, it screams defect. You can get away with replacing only one, you are within the guidelines for an AWD vehicle, and if it isn't AWD, then it doesn't matter that much anyways - just make sure it is replaced with the same tire. Goodyear should be giving you credit on that tire anyways...
-cody: maintenance forum moderator
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2007 Lexus GS450h
2010 Lexus RX350
1998 Lexus GS300 - 1jz-GTE swap
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