When printing the solid fill pages under troubleshooting you can see the magenta and the yellow fade the last third of the page on the right hand side.
The yellow was worse earlier but I cleaned all four laser windows with the wand five times each and this seemed to help some.
I changed the fuser earlier but that didn't help. Also recalibrated for paper.
Any ideas? I'm thinking the cleaning has done what it's going to do. Another dozen wipes probably won't matter.