This excerpt taken from the PNC 10-K filed Feb 29, 2008.
Commercial Mortgage Loan Servicing Assets
We owned an interest-only strip related to education loans totaling $59 million at December 31, 2006. This strip was retained from the sales of education loans to a third party trust prior to 2003. Loans that were held by the trust supporting the value of the strip were $88 million at December 31, 2006. The trust related to the securitization terminated in 2007 and our retained interest was reduced to zero due to distributions from the trust.