UK's Weir slips after FY revenue misses estimate, net debt rises
** Shares of engineering firm Weir Group WEIR.L down 6.1% at 3,194 pence ** Co's FY net debt increases to 1.27 bln pounds vs 0.54 bln pounds a year ago ** Co reports FY rev of 2.57 billion pounds ($3.43 billion) vs Jefferies' estimate of 2.59 bln pounds ** WEIR up ~14.05% YTD ($1 = 0.7492 pounds) (Reporting by Megha Kumari) ((Megha.Kumari@thomsonreuters.com;))