Via The Consumerist:
"Reader Ben's receipt doesn't match the serial number on his defective PS3, so GameStop and Sony are refusing to repair or exchange it.
This same kind of problem has happened to one of our readers before. It turns out that an employee had inadvertently entered the SKU instead of the serial number on our Reader's XBOX. He was eventually able to prove that he hadn't switched the XBOXs, but Ben is having a much more difficult time."