A MacNN reader reports winning a free iTunes song with the purchase of a Pepsi drink, but not being able to read the code printed on the bottle cap. "The code printed on the bottle cap is distorted and smudges as you loft out the cap liner." A Pepsi customer service rep acknowledged that there is a problem with the ink used in printing the code. Customers with unreadable caps are instructed to send the cap to Pepsi for a replacement code.