Texture issue

I have a strange issue when applying either spec or bump to my fuse_t texture.
(See picture)

I have not had this issue before. I have a single seat version using the same material settings, bump and spec with no issues. I have triple checked the mesh, and no changes compared to the working version.
It is only the starbord side that is affected

This was assembled in MCX for Prepar3D v4+
Any ideas?

Rotorhub
 

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