Canon i9900 issue

My i9900 is having printing issues. Not the usual banding across an entire image, but rather a 1" dark strip at the end of each print. When I say 'dark strip', I mean it's still the photo and recognizable as such, but is slightly but noticeably darker than the rest of the print. Only in the last 1".

Thoughts?

I'm not 100% sure about how to go about TS'ing this one but start by picking a known good test image and run a test print of the same image through several different apps. If the print has the same dark stripe in more than one app, print 2 back to back from the same app and compair them, If the second print has a larger stripe than I would have to say it's time to get the printer serviced.