Some Interstate owners have created a repository of aircraft data by requesting CD's from the FAA for various Interstates. Below is a link for the data that is currently in the repository (I've got about a third of the CD's in my possession uploaded so far) - each aircraft has a separate folder. In each folder is the data from the FAA, as well as a picture of the CD sleeve if that sleeve had additional notes. The individuals who requested this data from the FAA made notes on the CD sleeve about interesting modifications or repairs done to some of the aircraft. This would be a great way for owners to look up data for potential modifications: