Savvis ( SVVS) was upgraded at Kaufman Bros. from Hold to Buy. $31 Colocation business could generate 10% organic sales growth. Woodward Governor ( WGOV) was downgraded at Robert Baird from Outperform to Neutral. $34 price target. Airframe business is slowing down. Zions Bancorporation ( ZION) was upgraded at Credit Suisse to Neutral from Underperform on increased credit quality and improved visibility. Price target raised to $26 from $24.