Sony :: Crack On The Bottom, Manufacturing Defect-or Accidental Damage On NEW VGN Z690

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I have had the same issue with 10 days old Z690.

I found a small U-like crack around the bottom near the AC connector and the hinge are intact with the bottom housing.

I did not notice it was there after 10 days of use. Once I found it, I called Sony Customer Service to discuss about it , and I was connected to Tech Support for Repairing this unit. (I decided not to return it for credit since I already returned 4 Z690s for keyboard lifting issue for two, high-pitched noise, cosmetic damage and I got sick and tired of returning the VGN Z690)

here are some pics for the cosmetic damage (it is small but noticeable) and keyboard.
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Once the laptop arrived in the repair center, they gave me an estimate of $161.40 for replacement of bottom housing.

I should have sent it back for repair
but I gave the repair center one last chance and tried to save some time on placing new order.
I received the laptop on April 20th.

But high-pitched noise started to cry out for my attention...
which did not existed before the repair.. I sent it for repair on 22th and
it is still being diagnosed....