Austin Trust variable certificates, Austin series BOA 158, relating to California's East Bay Municipal Utility District, wastewater system subordinated revenue bonds, series 2007A, are rated 'AAA/A-1+'. The long-term component of the rating is based on the 'AAA' rated, AMBAC-insured East Bay Municipal Utility District, wastewater system subordinated revenue bonds, series 2007A. The short-term component of the rating is based on the liquidity facility provided by Bank of America N.A. until June 5, 2008. The stable outlook is based on that of the bond insurer.