Wachovia Bank N.A. municipal exempt receipts liquidity optional tender series 2007C23, relating to Michigan Higher Education Student Loan Authority student loan revenue bonds series XVII-Q, are rated 'AAA/A-1+'. The long-term component of the rating is based on the 'AAA' rated, Ambac-insured underlying bond. The short-term component of the rating is based on the liquidity facility provided by Wachovia Bank N.A. until April 1, 2008. The stable outlook is based on the bond insurer.