H5D Blue light on the top broken

[ALAIN]

Hello,
The blue top screen illumination on my H5C-60 has just stopped working.
Could you tell me how to open the hood? I loosened the 2 small screws for this but the cover still seems to hold, and I would not want to pull on it too much if this is not the correct method;)
Thank you in advance for your help.
Greetings from France,
Alain