My printer will no longer print shades of lighter grey, and there is often a line down the left side of the page. Several months ago I ran into some issues, and tried cleaning *every* piece of the printer. I am worried that I damaged something, somehow. I have changed the toner. I have re-aligned the printer. Reset settings. Everything I (with my non-existent knowledge) can think of. I print a lot of worksheets. Most of them come out perfect. Clear printing, nice and dark. But certain ones that have grey shading around certain areas, or lines that are light grey (vs black) just don't print that area. Is there an easy fix I am missing?