This is not the 'report' I was looking for, but looks like a summary of same report. The full report has pictures showing the 'poly' in the failed IP's:
http://www.arb.ca.gov/fuels/diesel/0...odsl_bosch.pdf

another article describing the problem:
Biodiesel Magazine

This is a good one!
http://www.crcao.com/reports/recents...%20rev%203.pdf