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I purchased a used T795. Bought new print heads and ink.  All ink cartridges work except the grey.  The infomation on the printer says the grey cartridge needs to be replace.  Has an expiration date of 1/1/70.  I followed the steps in the troubleshooting section.  I tried to clean the contacts, replaced with a new cartridge and still get the same error message.  I can't override the error message.  These are acelink cartridges.  As stated, the other 5 work.  Only the grey says it needs to be replaced.  Next option is to buy an or

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