The cable network which carries the Yankees' games is for sale, according to a report by Fortune magazine. The YES Network could be worth $3 billion or more, according to Fortune's calculations, which are based on the network's cash flow and what other regional networks have been worth. The Yankees own part of the network, along with the investment bank Goldman Sachs & Co. and former New Jersey Nets owner Ray Chambers. "We're testing the waters with a limited universe of quality buyers," Gerry Cardinale, a Goldman managing director, said. "We would consider selling only if we receive a full and fair price."