Epson Stylus Pro 4000 Reference Manual page 270

5. Press the Menu
Note:
If MNT TK NEAR FULL or MNT TNK FULL is displayed on the LCD,
you need to replace the maintenance tank. See "Replacing the
Maintenance Tank" on page 277.
6. Confirming that RAISE BOTH INK LEVERS is displayed on the
LCD, raise the ink levers on the right and left ink
compartments.
7. Confirming that REMOVE INK CRTG is displayed on the LCD,
remove the ink cartridges from the right ink compartment.
270
Maintenance and Transportation
button again to execute.