I am not aware of anything similar to "verify game cache" on the Wii U or any other console. However, you could try to move the game back to the internal storage to see if that fixes your problem.
If moving the game back to internal storage does fix your problem, there might be something wrong with your USB storage. However, if the problem persists, deleting and downloading the game once more may be the only solution left to you.
Luckily, it is possible to delete the game data without losing your save game. To do this, follow the steps listed below:
- Open System Settings.
- Select Data Management, which should be the second item from the left.
- Select Copy/Move/Delete Data.
- Choose the storage device on which the game is located.
- Choose the game whose data you want to delete.
- Choose Metroid Prime Trilogy. It should be listed as Software with a size of 7571 MB.
Do not choose Shared save data, because that's the save games you do not wish to delete!
- Touch the Delete button, confirm your choice, and wait patiently until the data is deleted. This process shouldn't take very long.
- After the game data is deleted, your Wii U will ask you: "Would you like to delete the save data too?" Make sure you hit Cancel here. Your Wii U will notify you that "The save data for this software will no longer be displayed in Data Management.", meaning you'll have to switch to Wii mode to delete those save games. Don't worry, as soon as you've downloaded the game again, its save files will reappear in Data Management.
- You may leave the System Settings and proceed to download the game anew.