Wall Street drifted lower without any catalyst to push stocks higher after blue chips closed near a four-year high last week. Earnings are not as typically strong as they have been - giving investors another reason to pause. But after the bell, Yum Brands released tastier-than-expected results. The parent company of KFC, Taco Bell and Pizza Hut beat sales and profit forecasts led by record store growth in China. Also, Boeing discovers 787 problem and Google and Facebook face Indian censorship.