Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially and for test purposes, try the COPY function on an old color printed document particularly with something in red.
Please post back results / observations of the above once tried.
Thank you for your kind understanding of machine generated / automated systems ads and offers.
Still, have you checked and/or tried performing a print head cleaning ?