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Result: If this was a temporary glitch, your printer should now function normally.
: A purchased "Reset Key" is required to bring the counter back to 0.00%.
The Epson ET-2400 uses an internal, non-replaceable maintenance box. Resetting the counter does not replace the ink pads; it only tricks the printer into thinking the box is empty again. A physical replacement of the pads is only necessary if they become truly saturated and leak.