e255SE Jamming from 2nd cassette

I have an e255SE with 380k on it. The copier works A-OK except that paper both constantly jams and wrinkles from the 2nd paper tray. We have removed the Paper drive unit and replaced all of the rollers. Everything looks good inside. The Paper drawer has Letter paper loaded in it and the LCD control panel displays letter size paper. The firmware has been updated to V330.

Any ideas?