Ok, I just got back from Sears. This is what happened. I first talked to the lady before going to Sears on the phone at Dunlop, and she told me that if it is in fact a defect, to go to Sears to get it checked, give them a reference number that she gave me, and they can replace it for free. Well, I went into Sears and told them my situation (that I noticed a bubble and don't know how it got there). They took off the tire, looked in the inside and showed me that it was in fact broken in the inside. They said that there's no apparent damage because my rim is ok, and that the outside is good too. SOOOO, they're gonna call Dunlop tomorrow with the reference number to see what to do. I'm crossing my fingers hoping he calls me to tell me that they'll pay for the whole tire! Wish me luck!