During a print, employee forgot to refill Magenta. The mutoh started beeping with (M) End. I refilled the ink and then display say Subtank refill. After waiting about 10 min, its keeps saying (M) end and then I remove cartridge and put it back in and it says refill sub-tank and then after 10 min of the same thing waiting it say (M) Ink End. I opened up the back and noticed lines on top and bottom are clear no ink. While the others are full of ink. The lines by the heads are full of ink. Any help would be great, tried calling my usual guy but he aint helping at all. Maybe someone I could call and walk me through. Thanks in advance