** Shares in Italian oil service company Saipem tumble after British rig-maker Lamprell Plc said itexpects its revenue this year to be about 10 pct belowexpectations.
** Stock down 7.6 pct & is 2nd biggest loser on the Stoxx600 on another weak day for the oil services sector.
** "The Lamprell profit warning is weighing on the stock astoo are a few broker changes," says a Milan-based trader
** Barclays cuts its target price on Saipem to 12 euros from20 euros while Canaccord Genuity cuts its rating to 'Sell' witha target price of 7.5 euros
** The slump in oil prices has prompted oil and gasoperators to cut investments, hurting oil contractors
** Saipem, which issued two profit warnings in 2013, saw itsshare price tumble in December after Russia scrapped the SouthStream gas pipeline project
** Italian oil major Eni, which owns 43 pct ofSaipem, recently put its plans to sell its stake in the oilcontractor on the backburner (RM: stephen.jewkes.thomsonreuters.com@reuters.net)