The last time an accounting firm was implicated with a major screw up it went belly up, remember Andersen which was swallowed up by E&Y. Now it seems that E&Y have their own dirty customers to deal with.So who exactly can we trust these days?Lehman file rocks Wall StreetBy Francesco Guerrera and Henny Sender in New York and Patrick Jenkins in London Published: March 12 2010 00:41 | Last updated