WARBURG BEGINS TENDER OFFER FOR SYMBION <SYMB> Symbion Inc said <Warburg, Pincus Capital Co L.P.> began a tender offer to purchase up to 2.5 mln shares, or about 33 pct, of Symbion's shares at 3.50 dlrs per share. Warburg already owns about 26 pct of Symbion. Symbion has 7,472,000 shares outstanding. The company makes artificial hearts. Symbion said its board and management are carefully reviewing the offer and on or before March 30 will advise its shareholders on whether it accepts or rejects the offer. If the tender offer is successful, Warburg wll own about 59 pct of Symbion.