As much as I don't want to I have to work on this machine. I don't do too much color. The patch sensor is getting very dirty. Alot of dusting in dv area especially magenta. DV's have about 60K on them. Are these difficult to replace and do they last. After a quick look I'm thinking they just unscrew from the big cylinder. If I do this job I get a decent sale on a second machine, b/w backup. TIA
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