OK so I just came home from the Apple Store. Genius wasn't able to see the issue. He also saw pictures. He went to backroom and talked to other geniuses. He tried to make idiot of me like I don't know what I see... He said it was pretty normal and phone is within specs... Is it?! The phone has no other issues and works properly. I don't care. This is not a cosmetic issue. It is MANUFACTURING issue! Then he was like "Apple is great, we always do our best bla bla..." and said he is gonna make one time exception and replace it. He said they won't replace it again if I come in with the same issue. Is this true? Because I wanna go back and ask for replacement... My ex and friend of mine both have iPhone 3Gs and they don't have this issue. I just want iPhone without light leak like many people have. I don't like those Fifth Avenue Apple "Geniuses"!!!
I went through almost the EXACT same experience!
I would try another store(thats what I did), or next time, bring your friend along and have them compare the two phones.