WASHINGTON (MarketWatch) -- The Federal Reserve has ended its probe of Goldman Sachs contracts with the Greek government that distort the country's debt levels, without taking any action, said Federal Reserve Board chairman Ben Bernanke on Wednesday. In testimony to Congress, Bernanke said Goldman Sachs GS, +2.12% in 2000 and 2001 did sell Greece products that lowered the country's debt-to-GDP ratio. This transaction happened before the Enron crisis when rules against accounting related transactions were set up, Bernanke said. "We believe that that situation is well under control," Bernanke said. Goldman now has procedures in place to make sure trades are not motivated by accounting, he noted. On a broader issue, U.S. banks exposure to European sovereign debt, either directly or through credit default swaps, is relatively limited, Bernanke said.