Gross! or, "My technology speaks Engrish"

I have a spifferific printer, up to 13x19 in 7 colors (two blacks, red, blue, CMYK), and a cartridge of "gloss optimizer." I need to replace the cyan, so I clicked 'how' on the ink out screen, and it gives me a list of these cartridges and the codes for them.

Photo Black : T0541
Cyan : T0542
Magenta : T0543
Yellow : T0544
Matte Black : T0548
Red : T0547
Blue : T0549
Grossoptimiza : T0540

Epson, your Japangrish is showing. :)