(Reuters) – Credit Suisse Group AG is trying to help the U.S. Department of Justice potentially build a case related to block trading against rivals Morgan Stanley and Goldman Sachs Group Inc, Bloomberg News reported on Friday. The Swiss bank’s push to provide assistance apparently goes beyond banks’ routine cooperation with requests for information, the report said, citing people familiar with the matter. Credit Suisse’s representatives have delivered a presentation to the U.S. Attorney’s Office for the Southern District of New York, flagging potential issues with the collapse of Archegos Cap…