Auto parts sellers slump after AutoZone's earnings report set a dour tone. Though Advance Auto...

Auto parts sellers slump after AutoZone's earnings report set a dour tone. Though Advance Auto Parts (AAP -1.5%) and O'Reilly (ORLY -0.9%) trade lower, it's shares of Pep Boys (PBY-OLD -12.4%) that are really getting clobbered after the company showed weak results of its own for Q3. The sector isn't getting any help from a mild start to the winter, but underlying service and merchandise sales trends are worrisome.