Jim Hancock
Old School Technician
Clean the guide rails thoroughly with a clean cloth and alcohol. Then lightly lube the rails with white lithium grease. Move the cut carriage and the printhead carriage back and forth the entire length of the printer 8-10 time to distribute the grease into the bearings. Wipe any excess grease off the rails. I would rerun the aging step at this point. If this doesn't work, the only thing left is the servo board.