Are you printing
any magenta? The reason I ask is I recently had cross contamination on the Y/M head on my Roland (a block of pure magenta was printing orange) which then lead to no magenta at all. I replaced the captops and wipers and everything was fine (well first I did some head soaking and ripped the machine apart, but I feel ok with doing that).
I bought captops, wipers, dampers and ink - but I only replaced the captops and wipers, I bought the dampers just in case - and I can always use ink, but I also read about ink feeding backward through the lines back to the cartridges - so I also had them "just in case".
I purchased from a fellow member
(Robert M) and I must say I received my order rather quickly and for a very reasonable price - he was a Merchant Member at the time...
Good luck! I searched for hours to an answer to my problem - and it really just came down to me feeling comfortable diagnosing, having the confidence to take the machine apart and having a bit of good luck I suppose.
Gene