As above this issue is a bit weird. The toner when installed will more often than not make a grinding/buzzing noise (like a gear is slipping or something) whenever it's trying to add the toner.

Sometime it will error out and I'll need to pull it out, do the usual cleaning business then put it back and try again. Often it'll then be fine. Sometimes it'll take a few trys but it'll then make that sound again. A dozen or more prints in we get the error again.

It's also wasting toner percentage on the chip each time I remove it and it now thinks it's empty when in reality it's mostly full.

I opened up the back cover today to service the HDD and found the attached. How is cyan toner getting back there? It must be related surely.

Anyone have this issue or have an idea where to start looking?