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Maintenance Mode is a mode that can be triggered when holding the Plus and Minus Buttons and pressing A on the Health Screen. CHANS scripts, RSOs, WiiConnect24 and the Wii Message Board are disabled in Maintenance Mode.
The only difference between this mode and normal mode is that the Message Board is disabled.
The intended purpose of this mode is intended to fix bricks related to banner scripting on development units, and was included in the retail menu for unknown reasons. Earlier theories included removal of personal data for use by repair personnel and it being a mode for fixing general banner bricks.