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I have been printing booklet mode and duplex with my MX922 for several months and all of a sudden it will not print duplex.  I have tried everything including above but still no luck - except wasting a lot of paper and ink.  Any advice?
Just ran a deep cleaning of the pageblk cartridge and decided to change the magenta and cyan cartridges because they were showing low.  When I changed the cyan cartridge the code 1681 came up indicating I had two yellow cartridges installed.  Thinkin...