Actually, in mimaki's website project. or whatever it is, there are several videos regarding in how to change the dx5 printhead....
You only have to look and search properly.
About the capping station and printhead you wont find these on the manual.
The steps are only sent to mimaki's official services. thats why there are many difficult to find.
Anyway, replacion capping station. and printhead is easy. just look in jv33 bible or ask if somebody con send some info to you.
good luck.