** Auto parts retailer AutoZone's AZO.N shares fall 3% to $4,000 premarket
** Co reports Q4 EPS of $48.71/share vs analysts' average estimates of $50.80/share - data compiled by LSEG
** AZO posts Q4 net sales of $6.24 bln in line with Wall Street estimates
** As of last close, stock had risen 28.7% YTD