Nintendo’s Japanese support has announced that they will end support for repairs for the Wii U. When exactly? Well, that really depends on when the current stock of parts runs out.
The press release was published on Japanese support site for Nintendo
As for Wii U accessories (ie Gamepad, etc.), repairs for these will end at the same time as the main console unit.
For those in the west, Wii U fixes have already stopped, and the only options available on Nintendo’s support page are for Switch, Joy-Con, 3DS consoles, Game & Watch (modern versions), Mario Kart Live, and NES and SNES Classic Minis.
