The TCDS is considered to be public information. Did you check the records available on rgl.faa.gov?
http://rgl.faa.gov/Regulatory_and_Gu...e?OpenFrameset
If that resource doesn't have what you need, contact the FAA aircraft certification office listed in the current TCDS version as responsible for the certificate and request that they pull their records of the historical revisions. They may not have complete records, but they should be willing to provide you with a copy of what they have. There is a records expert in each office and they are typically very helpful.