What are these in the diagnostic section of the printer

[philm001]

So I took apart some of the components for the IU and I noticed that the transfer drum, the toner is not sticking to it for hte black ink. I sthere anything that I can do on my end?

[philm001]

Hello all,

I recently called the tech support line and they recommeneded that I replace the IU of my printer. However, I just want to be sure that this will fix the issue as I see that replacing the IU is not likely at times. 

I went to the diagnostic for the Xeror phaser 6500 to check the life of the IU and I was wodnering what these are:

Life IU Deve K - 6332

Life IU Xero - 80759

Life IUT K Time - 532228

Life IU C Time - 172372

Life IU M Time - 175571

Life IU Y Time - 210277

What are these different IU life time measurements?