epson 9600 pro printer?

I was given a epson 9600 pro that has not been used since 2004. I have been trying to revive it. The original ink is still in it. Of course the ink shows expired as of 2005. I purchased the print head cleaning kit. I worked on it for three days. Light magenta will not clear, it has cleared only a minimum. The top line on the nosile printout only prints partially on three colors. Made good progress but haven't got it printing good yet. My question is, do you think if I purchase a new ink cartrage set and install all new ink that would cure the problem?