Canon Pro-10s inkjet printer (Shrewsbury SY1)

This printer has had a lot of use but produces superior images up to A3+.
It has 10 compatible cartridges installed all about half full but I haven't been
able to get the grey to print. Perhaps someone who likes tinkering with printers
could get to going? It is quite heavy so would need collecting. It will need a mains lead
and usb/computer cable, all easily obtainable.