The Diagnosis program allows you to inspect and fix Lyoko's software.
This program is available only in Lyoko's Terminal, or to any device connected to it.
The bottom-left button will allow you to fix any errors debugged from Sector Five's interface caused by Software Attacks launched by XANA.
On the top-left corner, a green “OK” icon will be displayed if the software is intact. Otherwise, it will turn into a red warning icon.
In the middle, two rows filled with software modules are present. Each module handles specific parts of Lyoko's software, such as Energy circulation or the Superscan. You can use the arrows on the right to switch pages.
Right-clicking a module will send you a message in the chat explaining what the module does and what the effects will be if it is damaged, including how to fix it in such a scenario.
If a module is in red, it is damaged and has yet to be debugged from Sector Five. Once debugged, it will become orange, awaiting for you to apply the fix with the bottom-left button.