Need Help Need Advice Replacing Mimaki UJF-3042 HG Ink Damper

What do you mean misfiring what does your test print look like for the Cyan ?

 

I suggest you don't do that. It should be done by someone who has done it before. The procedure is tricky.
I think you need to deflate and do over night nozzle wash.
A how to deflate video is here PLEASE use a deflate tool or make one of your own, I wrap medical tape around mine.
https://digiprint-parts.myshopify.com/pages/faq-about-mimaki-uv-printers

 

Put a mirror on the bed and see what the surface of the print head looks like, Gently clean it with maint fluid and a swab then do a head soak for 5 mins or so . Fill the cap with fluid and set the time . Then do two cleanings on the Cyan and check the output with a head test . If its the same or worse . Do an air purge on the cyan damper and another cleaning cycle and check the test again. You should also make sure the cap station is clean and the rubber seal is flexible and not distorted . Your Damper is probably fine if your getting ink at the head . A bad damper will either clog solid , leak or admit air - They are indeed tricky to replace - The head leads are easily damaged and if you get ink on your flex cable connectors it can eat the contacts off the flex cables .

 

When you do a nozzle test does the print look identical each time or do the missing nozzles fluctuate?

By the way damper replacement is super easy and I have walked our most novice customers through this process very easily don't let these people scare you.