Texture on the ceiling

Hello there,
I would like to have some help on a scene I rendered. I put the same texture on the wall, floor and ceiling but this last one is kind of brown on the render. I tried to explod the group and return faces but nothing work. Do you think it is because of the lack of light ?

Thank you for your response.

AmbientOcclusion uses the material assigned to the front faces. Have you tried to change the material on the front face?

Yes I tried and it is always the same whatever the color I use :confused:

Can you please send us the model so we can take a look?

Yes of course, how can I send you the file ?

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