Need Help Backlit defects

[Antoce]

Hello
Please help me with the following situation. After positioning the backlit on the lumia profile, after the light was turned on, the following defects appeared in the fabric.
what could it be?

 

[balstestrat]

Seems like something has been scratching it/the coating. Or there was a production defect on that spot.

 

[Antoce]

Thanks for the reply. The print is in perfect condition. The fabric of the material has problems. The final customer says it could be from the assembly but the backlit was not stretched here, so it was not pulled.

 

[Yeahgor]

How deep is this scratches? As I see it's looks like mechanical scratch by metal brush or big grain sand paper.