I have a 2008k machine the blood leak and dimmness will let me cal. it and work fine for about a week then come back un calibrated. what would cause that to happen ?

had one do this a few months ago ended up being the functional board. Wouldnt hold cal

Yup i had the same issue, (Functional Board)

Had this on almost all of my new K machines. I took the blood leak detector out and found finger prints on almost all of them.

I have had two of these and the funky board always fixed it.

Had the same issue as 1234. Drove me nuts until the dang things were cleaned.