chirping only cyan, at around the same place... electrical for sure. But the cause? gets fun.
one, update firmware. This isn't "block printing" per se, but a firmware update fixed that a while back.
two, pop off the top cover (the biggest one) and watch the ink lines as the printer is printing. I had a vs-420 with the ink lines not quite bundled up enough, and one was bumping into a divider and causing some nozzles to fire.
three, well, anything after those... head, cables, boards.. gets iffy.