Need Help PRINTHEAD NOT PRINTING CYAN OR MAGENTA! - FUSE KEEPS BLOWING? XC-540

Hi Guys really need some help on my Roland XC-540 it has been offline for around 2 months now.
The CYAN & Magenta is not firing at all I changed the fuse and it has blown almost instantly when I put it in and turned it on. Luckily I have a spare fuse however thinking there is no point putting the new one in without finding out why it has blown again.

Do I need to change the transistors too? I changed the cables and fuse but not the transistor. The Yellow and Black print head is perfect and working as normal just the Magenta and cyan.

Here is a link to my original post but had no luck with solving this.

https://signs101.com/threads/proble...anged-fuse-roland-xc-540.150414/#post-1407563

Thanks