If head soak won't solve this, a new print head is required. In the capping position, try to pull with a syringe through the cap-top coresponding to group A(Cyan_Black). Just take out the tube coresponding to the cap-top from group A, from the junction with the pump tube, put a syringe there and pull gently couple of times. If this is not working, then you'll need a new print-head for sure.