yeah, we/he did some other things too... but tech that did it, up and moved to Florida. Or id call and ask him LOL
developer change, feel like maybe he changed the donor rollers... or just cleaned them. i remember hearing "they get a buildup and can cause dark spots"
old info in my head though, sorry not more help.
search magenta spitting here. theres multiple threads about it. could cross over to help with yellow?