AutoZone Inc. AZO shares fell 6.4% in premarket trade Wednesday to a seven-month low, following a disappointing earnings release from Advance Auto Parts Inc. AutoZone reported a better-than-expected quarterly profit last week, but missed on sales due to weaker-than expected March sales. William Rhodes, AutoZone CEO, said that he had seen a competitor change their pricing but that he saw no indication that the competitor’s price was lower than AutoZone. Meanwhile, shares…