Investment banks and broker dealers borrowed more than $30 billion a day from the Federal Reserve's discount window this past week, but showed only tepid interest in a separate 28-day lending facility from the Fed. The 20 primary dealers borrowed $37 billion from the discount window, $8.2 billion more than the previous week. For the entire week, loans to the 20 primary dealers averaged $32.9 billion a day, up $19.5 billion from the previous week.