I tried to redo normals, but this doesn't seem to be the issue here. When imported to Unreal the different colored items have missing polies.

I tried to redo normals, but this doesn't seem to be the issue here. When imported to Unreal the different colored items have missing polies.

easy, recalculate the normals of the oddly colored area of the model. the normals look like they have been reversed.