I have a Laserjet 4350tn that prints perfect from all trays except when printing envelopes from tray 1. The envelope gets fed through the paper path normally but leaves a streak about an inch away from the return address. If I rub my finger over the print it smudges. I physically inspected the transfer, and fuser rollers. Maintenance kit still has over 50% life but have not been changed in over 3 years.