APAlbert Barrera of Odessa, Texas, walked into a Sears store recently with a pressing question for the manager: "If Sears closes, who will service my refrigerator?" Barrera had bought a Kenmore refrigerator for $529 several months earlier, and along with it, he purchased a three-year service warranty that cost $229 — almost half as much as the refrigerator. Now he's worried that Sears could go out of business and that his warranty will be canceled as a result.