The ratings assigned to District of Columbia's three sub-series general fund recovery bonds are upgraded for the following reasons: Sub-series 1991B-1 is being upgraded to 'AA/A-1+' from 'AA-/1+' following the substitution of the LOC provided by Societe Generale, with an LOC provided by Morgan Guaranty Trust Co. of New York; Sub-series 1991B-2 is being upgraded to 'AA/A-1+' from 'AA-/1+' following the substitution of the LOC provided by Bank of America, with an LOC provided by Morgan Guaranty Trust Co. of New York; and Sub-series 1991B-3 is upgraded to 'AA/A-1+' from 'AA-/1+' following substitution of the LOC provided by Bank of America, with an LOC provided by Morgan Guaranty Trust Co. of New York. The new LOCs will expire on June