Epson Stylus Pro 4400 Reference Manual page 303

10. Make sure LOWER THE LEFT INK LEVER appears on the LCD,
and then lower the ink lever on the left ink compartment.
11. The printer starts draining ink, and DRAINING XX% appears on
the LCD. Wait until draining is complete.
12. When draining is complete, RAISE THE LEFT INK LEVER
appears on the LCD. Raise the ink lever on the left ink
compartment.
Maintenance and Transportation
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