LBHI is seeking information as to how Barclays was able to realize a profit of billions so quickly after the purchase of Lehmans.
They must already know that errors / unfair asset valuations took place. The goal here for LBHI would be to recover additional funds from Barclays.
If you have the time, read Docket #4067 (on epiq systems), it goes into the details of why LBHI believes they received an unfair deal and are now seeking discovery.