MG5220 - Subtle Banding on Pattern Check page for Cyan

[rmfought]

HI folks,

I've got an MG5220 that is giving me some banding in my printed photos about two inches down from the top.

When I print the Pattern Check page I the bottom two cyan block are split in half, with the bottom half lighter than the top half (lighting adjusted to make the lighter cyan bands visible):

I cleaned and flushed the print head with isopropyl alcohol then hot water, but I still get the same pattern.

Any ideas?