A few months ago we received a Z3200ps with numerous problems: Frayed belt, ink cartridge in the carriage way, dried out printheads, over saturated service station. After repairing the belt, cleaning up the carriage way, replacing the printheads, and cleaning out the service station everything seems to be running smoothly now with the exception of the red ink fading out part the way through a print.
We figured it may be the printhead as the alignment pages were coming out with breaks in the lines for red so got a replacement under warranty, and that seemed to fix the breaks, but not the red being missing in large prints. We tried one of the large color band prints from Z3200.com and that highlighted the fading issue.
Any ideas or suggestions on what parts to investigate?