Fujitsu fi-6770 Scanner ADF Jamming

The auto document feeder on our fi-6770 repeatedly jams to the point that not even plain flat fresh paper will go through any more. When it first started happening I replaced the pick rollers and the brake roller. This solved the problem for a while. After a while it started jamming up all the time. After a thorough cleaning of scraping off all build up on the internal rollers and putting the alcohol sprayed cleaning page through numerous times it started working again.

Now no amount of cleaning or roller changing will fix it. The cleaning page won’t even go through any more it jams up as well. Any suggestions or ideas on how to fix this other than buy a new ADF?